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Finding the Fourth Proportional to 122.87, 169.59 and 81.43

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Solution

The fourth proportional to 122.87, 169.59 and 81.43 is: 112.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.87 : 169.59 = 81.43 : x
  2. Step 2: Convert to fraction form
    122.87/169.59 = 81.43/x
  3. Step 3: Cross multiply
    122.87x = 169.59 × 81.43
  4. Step 4: Simplify right side
    122.87x = 13,809.71
  5. Step 5: Solve for x
    x = 13,809.71/122.87
  6. Step 6: Final answer
    x = 112.39

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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.