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Finding the Fourth Proportional to 91,407.60, 137,060.46 and 28,209.78

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Solution

The fourth proportional to 91,407.60, 137,060.46 and 28,209.78 is: 42,298.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,407.60 : 137,060.46 = 28,209.78 : x
  2. Step 2: Convert to fraction form
    91,407.60/137,060.46 = 28,209.78/x
  3. Step 3: Cross multiply
    91,407.60x = 137,060.46 × 28,209.78
  4. Step 4: Simplify right side
    91,407.60x = 3,866,445,423.30
  5. Step 5: Solve for x
    x = 3,866,445,423.30/91,407.60
  6. Step 6: Final answer
    x = 42,298.95

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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.