Home / 138,128.28-207,171.91-38,278.06

Finding the Fourth Proportional to 138,128.28, 207,171.91 and 38,278.06

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Solution

The fourth proportional to 138,128.28, 207,171.91 and 38,278.06 is: 57,411.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,128.28 : 207,171.91 = 38,278.06 : x
  2. Step 2: Convert to fraction form
    138,128.28/207,171.91 = 38,278.06/x
  3. Step 3: Cross multiply
    138,128.28x = 207,171.91 × 38,278.06
  4. Step 4: Simplify right side
    138,128.28x = 7,930,138,609.90
  5. Step 5: Solve for x
    x = 7,930,138,609.90/138,128.28
  6. Step 6: Final answer
    x = 57,411.41

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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.