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Finding the Fourth Proportional to 81,188.80, 121,769.92 and 28,585.92

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Solution

The fourth proportional to 81,188.80, 121,769.92 and 28,585.92 is: 42,874.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,188.80 : 121,769.92 = 28,585.92 : x
  2. Step 2: Convert to fraction form
    81,188.80/121,769.92 = 28,585.92/x
  3. Step 3: Cross multiply
    81,188.80x = 121,769.92 × 28,585.92
  4. Step 4: Simplify right side
    81,188.80x = 3,480,905,191.53
  5. Step 5: Solve for x
    x = 3,480,905,191.53/81,188.80
  6. Step 6: Final answer
    x = 42,874.20

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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.