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Finding the Fourth Proportional to 112.65, 168.91 and 74.15

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Solution

The fourth proportional to 112.65, 168.91 and 74.15 is: 111.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.65 : 168.91 = 74.15 : x
  2. Step 2: Convert to fraction form
    112.65/168.91 = 74.15/x
  3. Step 3: Cross multiply
    112.65x = 168.91 × 74.15
  4. Step 4: Simplify right side
    112.65x = 12,524.25
  5. Step 5: Solve for x
    x = 12,524.25/112.65
  6. Step 6: Final answer
    x = 111.18

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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.