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Finding the Fourth Proportional to 112.57, 168.70 and 81.99

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Solution

The fourth proportional to 112.57, 168.70 and 81.99 is: 122.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.57 : 168.70 = 81.99 : x
  2. Step 2: Convert to fraction form
    112.57/168.70 = 81.99/x
  3. Step 3: Cross multiply
    112.57x = 168.70 × 81.99
  4. Step 4: Simplify right side
    112.57x = 13,831.66
  5. Step 5: Solve for x
    x = 13,831.66/112.57
  6. Step 6: Final answer
    x = 122.87

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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.