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Finding the Fourth Proportional to 112.42, 168.61 and 47.43

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Solution

The fourth proportional to 112.42, 168.61 and 47.43 is: 71.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.42 : 168.61 = 47.43 : x
  2. Step 2: Convert to fraction form
    112.42/168.61 = 47.43/x
  3. Step 3: Cross multiply
    112.42x = 168.61 × 47.43
  4. Step 4: Simplify right side
    112.42x = 7,997.17
  5. Step 5: Solve for x
    x = 7,997.17/112.42
  6. Step 6: Final answer
    x = 71.14

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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.