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Finding the Fourth Proportional to 122.52, 169.02 and 112.80

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Solution

The fourth proportional to 122.52, 169.02 and 112.80 is: 155.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.52 : 169.02 = 112.80 : x
  2. Step 2: Convert to fraction form
    122.52/169.02 = 112.80/x
  3. Step 3: Cross multiply
    122.52x = 169.02 × 112.80
  4. Step 4: Simplify right side
    122.52x = 19,065.46
  5. Step 5: Solve for x
    x = 19,065.46/122.52
  6. Step 6: Final answer
    x = 155.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.