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Finding the Fourth Proportional to 122.80, 169.53 and 87.88

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Solution

The fourth proportional to 122.80, 169.53 and 87.88 is: 121.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.80 : 169.53 = 87.88 : x
  2. Step 2: Convert to fraction form
    122.80/169.53 = 87.88/x
  3. Step 3: Cross multiply
    122.80x = 169.53 × 87.88
  4. Step 4: Simplify right side
    122.80x = 14,898.30
  5. Step 5: Solve for x
    x = 14,898.30/122.80
  6. Step 6: Final answer
    x = 121.32

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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.