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Finding the Fourth Proportional to 122.83, 169.34 and 87.85

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Solution

The fourth proportional to 122.83, 169.34 and 87.85 is: 121.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.83 : 169.34 = 87.85 : x
  2. Step 2: Convert to fraction form
    122.83/169.34 = 87.85/x
  3. Step 3: Cross multiply
    122.83x = 169.34 × 87.85
  4. Step 4: Simplify right side
    122.83x = 14,875.66
  5. Step 5: Solve for x
    x = 14,875.66/122.83
  6. Step 6: Final answer
    x = 121.11

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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.