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Finding the Fourth Proportional to 639,397,966.40, 959,096,949.60 and 639,397,966.40

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Solution

The fourth proportional to 639,397,966.40, 959,096,949.60 and 639,397,966.40 is: 959,096,949.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,397,966.40 : 959,096,949.60 = 639,397,966.40 : x
  2. Step 2: Convert to fraction form
    639,397,966.40/959,096,949.60 = 639,397,966.40/x
  3. Step 3: Cross multiply
    639,397,966.40x = 959,096,949.60 × 639,397,966.40
  4. Step 4: Simplify right side
    639,397,966.40x = 613,244,639,154,683,264
  5. Step 5: Solve for x
    x = 613,244,639,154,683,264/639,397,966.40
  6. Step 6: Final answer
    x = 959,096,949.60

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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.