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Finding the Fourth Proportional to 38,431.80, 57,655.80 and 12,139.20

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Solution

The fourth proportional to 38,431.80, 57,655.80 and 12,139.20 is: 18,211.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,431.80 : 57,655.80 = 12,139.20 : x
  2. Step 2: Convert to fraction form
    38,431.80/57,655.80 = 12,139.20/x
  3. Step 3: Cross multiply
    38,431.80x = 57,655.80 × 12,139.20
  4. Step 4: Simplify right side
    38,431.80x = 699,895,287.36
  5. Step 5: Solve for x
    x = 699,895,287.36/38,431.80
  6. Step 6: Final answer
    x = 18,211.36

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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.