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Finding the Fourth Proportional to 81.87, 112.91 and 59.89

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Solution

The fourth proportional to 81.87, 112.91 and 59.89 is: 82.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.87 : 112.91 = 59.89 : x
  2. Step 2: Convert to fraction form
    81.87/112.91 = 59.89/x
  3. Step 3: Cross multiply
    81.87x = 112.91 × 59.89
  4. Step 4: Simplify right side
    81.87x = 6,762.18
  5. Step 5: Solve for x
    x = 6,762.18/81.87
  6. Step 6: Final answer
    x = 82.60

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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.