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Finding the Fourth Proportional to 81.60, 112.62 and 63.14

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Solution

The fourth proportional to 81.60, 112.62 and 63.14 is: 87.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.60 : 112.62 = 63.14 : x
  2. Step 2: Convert to fraction form
    81.60/112.62 = 63.14/x
  3. Step 3: Cross multiply
    81.60x = 112.62 × 63.14
  4. Step 4: Simplify right side
    81.60x = 7,110.26
  5. Step 5: Solve for x
    x = 7,110.26/81.60
  6. Step 6: Final answer
    x = 87.14

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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.