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Finding the Fourth Proportional to 72,399.40, 108,519.90 and 25,628.20

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Solution

The fourth proportional to 72,399.40, 108,519.90 and 25,628.20 is: 38,414.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,399.40 : 108,519.90 = 25,628.20 : x
  2. Step 2: Convert to fraction form
    72,399.40/108,519.90 = 25,628.20/x
  3. Step 3: Cross multiply
    72,399.40x = 108,519.90 × 25,628.20
  4. Step 4: Simplify right side
    72,399.40x = 2,781,169,701.18
  5. Step 5: Solve for x
    x = 2,781,169,701.18/72,399.40
  6. Step 6: Final answer
    x = 38,414.26

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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.