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Finding the Fourth Proportional to 39,862.80, 59,842.80 and 20,131.20

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Solution

The fourth proportional to 39,862.80, 59,842.80 and 20,131.20 is: 30,221.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,862.80 : 59,842.80 = 20,131.20 : x
  2. Step 2: Convert to fraction form
    39,862.80/59,842.80 = 20,131.20/x
  3. Step 3: Cross multiply
    39,862.80x = 59,842.80 × 20,131.20
  4. Step 4: Simplify right side
    39,862.80x = 1,204,707,375.36
  5. Step 5: Solve for x
    x = 1,204,707,375.36/39,862.80
  6. Step 6: Final answer
    x = 30,221.34

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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.