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Finding the Fourth Proportional to 138,001.72, 207,265.20 and 85,776.16

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Solution

The fourth proportional to 138,001.72, 207,265.20 and 85,776.16 is: 128,827.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,001.72 : 207,265.20 = 85,776.16 : x
  2. Step 2: Convert to fraction form
    138,001.72/207,265.20 = 85,776.16/x
  3. Step 3: Cross multiply
    138,001.72x = 207,265.20 × 85,776.16
  4. Step 4: Simplify right side
    138,001.72x = 17,778,412,957.63
  5. Step 5: Solve for x
    x = 17,778,412,957.63/138,001.72
  6. Step 6: Final answer
    x = 128,827.47

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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.