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Finding the Fourth Proportional to 112.71, 168.99 and 82.29

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Solution

The fourth proportional to 112.71, 168.99 and 82.29 is: 123.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.71 : 168.99 = 82.29 : x
  2. Step 2: Convert to fraction form
    112.71/168.99 = 82.29/x
  3. Step 3: Cross multiply
    112.71x = 168.99 × 82.29
  4. Step 4: Simplify right side
    112.71x = 13,906.19
  5. Step 5: Solve for x
    x = 13,906.19/112.71
  6. Step 6: Final answer
    x = 123.38

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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.