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Finding the Fourth Proportional to 112.61, 168.92 and 31.46

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Solution

The fourth proportional to 112.61, 168.92 and 31.46 is: 47.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.61 : 168.92 = 31.46 : x
  2. Step 2: Convert to fraction form
    112.61/168.92 = 31.46/x
  3. Step 3: Cross multiply
    112.61x = 168.92 × 31.46
  4. Step 4: Simplify right side
    112.61x = 5,313.38
  5. Step 5: Solve for x
    x = 5,313.38/112.61
  6. Step 6: Final answer
    x = 47.18

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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.