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Finding the Fourth Proportional to 81,115.20, 121,672.80 and 74,116.80

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Solution

The fourth proportional to 81,115.20, 121,672.80 and 74,116.80 is: 111,175.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,115.20 : 121,672.80 = 74,116.80 : x
  2. Step 2: Convert to fraction form
    81,115.20/121,672.80 = 74,116.80/x
  3. Step 3: Cross multiply
    81,115.20x = 121,672.80 × 74,116.80
  4. Step 4: Simplify right side
    81,115.20x = 9,017,998,583.04
  5. Step 5: Solve for x
    x = 9,017,998,583.04/81,115.20
  6. Step 6: Final answer
    x = 111,175.20

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1.5x scale

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.