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Finding the Fourth Proportional to 112.56, 168.88 and 58.42

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Solution

The fourth proportional to 112.56, 168.88 and 58.42 is: 87.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.56 : 168.88 = 58.42 : x
  2. Step 2: Convert to fraction form
    112.56/168.88 = 58.42/x
  3. Step 3: Cross multiply
    112.56x = 168.88 × 58.42
  4. Step 4: Simplify right side
    112.56x = 9,865.97
  5. Step 5: Solve for x
    x = 9,865.97/112.56
  6. Step 6: Final answer
    x = 87.65

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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.