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Finding the Fourth Proportional to 80,891.91, 111,631.01 and 45,081.20

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Solution

The fourth proportional to 80,891.91, 111,631.01 and 45,081.20 is: 62,212.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,891.91 : 111,631.01 = 45,081.20 : x
  2. Step 2: Convert to fraction form
    80,891.91/111,631.01 = 45,081.20/x
  3. Step 3: Cross multiply
    80,891.91x = 111,631.01 × 45,081.20
  4. Step 4: Simplify right side
    80,891.91x = 5,032,459,941.68
  5. Step 5: Solve for x
    x = 5,032,459,941.68/80,891.91
  6. Step 6: Final answer
    x = 62,212.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.