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Finding the Fourth Proportional to 80.87, 111.45 and 62.42

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Solution

The fourth proportional to 80.87, 111.45 and 62.42 is: 86.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.87 : 111.45 = 62.42 : x
  2. Step 2: Convert to fraction form
    80.87/111.45 = 62.42/x
  3. Step 3: Cross multiply
    80.87x = 111.45 × 62.42
  4. Step 4: Simplify right side
    80.87x = 6,956.71
  5. Step 5: Solve for x
    x = 6,956.71/80.87
  6. Step 6: Final answer
    x = 86.02

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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.