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Finding the Fourth Proportional to 639,543,640.40, 959,315,460.60 and 639,543,640.40

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Solution

The fourth proportional to 639,543,640.40, 959,315,460.60 and 639,543,640.40 is: 959,315,460.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,543,640.40 : 959,315,460.60 = 639,543,640.40 : x
  2. Step 2: Convert to fraction form
    639,543,640.40/959,315,460.60 = 639,543,640.40/x
  3. Step 3: Cross multiply
    639,543,640.40x = 959,315,460.60 × 639,543,640.40
  4. Step 4: Simplify right side
    639,543,640.40x = 613,524,101,964,126,720
  5. Step 5: Solve for x
    x = 613,524,101,964,126,720/639,543,640.40
  6. Step 6: Final answer
    x = 959,315,460.60

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Double scale
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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.