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Finding the Fourth Proportional to 81,034.60, 121,499.10 and 72,740.20

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Solution

The fourth proportional to 81,034.60, 121,499.10 and 72,740.20 is: 109,062.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,034.60 : 121,499.10 = 72,740.20 : x
  2. Step 2: Convert to fraction form
    81,034.60/121,499.10 = 72,740.20/x
  3. Step 3: Cross multiply
    81,034.60x = 121,499.10 × 72,740.20
  4. Step 4: Simplify right side
    81,034.60x = 8,837,868,833.82
  5. Step 5: Solve for x
    x = 8,837,868,833.82/81,034.60
  6. Step 6: Final answer
    x = 109,062.90

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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.