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Finding the Fourth Proportional to 91,523.80, 137,139.90 and 67,904.20

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Solution

The fourth proportional to 91,523.80, 137,139.90 and 67,904.20 is: 101,748.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,523.80 : 137,139.90 = 67,904.20 : x
  2. Step 2: Convert to fraction form
    91,523.80/137,139.90 = 67,904.20/x
  3. Step 3: Cross multiply
    91,523.80x = 137,139.90 × 67,904.20
  4. Step 4: Simplify right side
    91,523.80x = 9,312,375,197.58
  5. Step 5: Solve for x
    x = 9,312,375,197.58/91,523.80
  6. Step 6: Final answer
    x = 101,748.13

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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.