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Finding the Fourth Proportional to 72,139.68, 108,209.52 and 25,381.62

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Solution

The fourth proportional to 72,139.68, 108,209.52 and 25,381.62 is: 38,072.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,139.68 : 108,209.52 = 25,381.62 : x
  2. Step 2: Convert to fraction form
    72,139.68/108,209.52 = 25,381.62/x
  3. Step 3: Cross multiply
    72,139.68x = 108,209.52 × 25,381.62
  4. Step 4: Simplify right side
    72,139.68x = 2,746,532,917.02
  5. Step 5: Solve for x
    x = 2,746,532,917.02/72,139.68
  6. Step 6: Final answer
    x = 38,072.43

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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.