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Finding the Fourth Proportional to 639,781,356.70, 959,672,035.05 and 639,781,356.70

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Solution

The fourth proportional to 639,781,356.70, 959,672,035.05 and 639,781,356.70 is: 959,672,035.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,781,356.70 : 959,672,035.05 = 639,781,356.70 : x
  2. Step 2: Convert to fraction form
    639,781,356.70/959,672,035.05 = 639,781,356.70/x
  3. Step 3: Cross multiply
    639,781,356.70x = 959,672,035.05 × 639,781,356.70
  4. Step 4: Simplify right side
    639,781,356.70x = 613,980,276,571,339,008
  5. Step 5: Solve for x
    x = 613,980,276,571,339,008/639,781,356.70
  6. Step 6: Final answer
    x = 959,672,035.05

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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.