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Finding the Fourth Proportional to 112.52, 168.54 and 86.65

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Solution

The fourth proportional to 112.52, 168.54 and 86.65 is: 129.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.52 : 168.54 = 86.65 : x
  2. Step 2: Convert to fraction form
    112.52/168.54 = 86.65/x
  3. Step 3: Cross multiply
    112.52x = 168.54 × 86.65
  4. Step 4: Simplify right side
    112.52x = 14,604.19
  5. Step 5: Solve for x
    x = 14,604.19/112.52
  6. Step 6: Final answer
    x = 129.79

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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.