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Finding the Fourth Proportional to 112.79, 168.90 and 103.88

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Solution

The fourth proportional to 112.79, 168.90 and 103.88 is: 155.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.79 : 168.90 = 103.88 : x
  2. Step 2: Convert to fraction form
    112.79/168.90 = 103.88/x
  3. Step 3: Cross multiply
    112.79x = 168.90 × 103.88
  4. Step 4: Simplify right side
    112.79x = 17,545.33
  5. Step 5: Solve for x
    x = 17,545.33/112.79
  6. Step 6: Final answer
    x = 155.56

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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.