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Finding the Fourth Proportional to 639,576,019.70, 959,364,029.55 and 639,576,019.70

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Solution

The fourth proportional to 639,576,019.70, 959,364,029.55 and 639,576,019.70 is: 959,364,029.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,576,019.70 : 959,364,029.55 = 639,576,019.70 : x
  2. Step 2: Convert to fraction form
    639,576,019.70/959,364,029.55 = 639,576,019.70/x
  3. Step 3: Cross multiply
    639,576,019.70x = 959,364,029.55 × 639,576,019.70
  4. Step 4: Simplify right side
    639,576,019.70x = 613,586,227,462,942,208
  5. Step 5: Solve for x
    x = 613,586,227,462,942,208/639,576,019.70
  6. Step 6: Final answer
    x = 959,364,029.55

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.