Home / 80,986.10-121,426.35-72,691.70

Finding the Fourth Proportional to 80,986.10, 121,426.35 and 72,691.70

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Solution

The fourth proportional to 80,986.10, 121,426.35 and 72,691.70 is: 108,990.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,986.10 : 121,426.35 = 72,691.70 : x
  2. Step 2: Convert to fraction form
    80,986.10/121,426.35 = 72,691.70/x
  3. Step 3: Cross multiply
    80,986.10x = 121,426.35 × 72,691.70
  4. Step 4: Simplify right side
    80,986.10x = 8,826,687,806.30
  5. Step 5: Solve for x
    x = 8,826,687,806.30/80,986.10
  6. Step 6: Final answer
    x = 108,990.16

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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.