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Finding the Fourth Proportional to 138,487.40, 207,731.10 and 85,725.80

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Solution

The fourth proportional to 138,487.40, 207,731.10 and 85,725.80 is: 128,588.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,487.40 : 207,731.10 = 85,725.80 : x
  2. Step 2: Convert to fraction form
    138,487.40/207,731.10 = 85,725.80/x
  3. Step 3: Cross multiply
    138,487.40x = 207,731.10 × 85,725.80
  4. Step 4: Simplify right side
    138,487.40x = 17,807,914,732.38
  5. Step 5: Solve for x
    x = 17,807,914,732.38/138,487.40
  6. Step 6: Final answer
    x = 128,588.70

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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.