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Finding the Fourth Proportional to 123.37, 170.17 and 81.90

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Solution

The fourth proportional to 123.37, 170.17 and 81.90 is: 112.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.37 : 170.17 = 81.90 : x
  2. Step 2: Convert to fraction form
    123.37/170.17 = 81.90/x
  3. Step 3: Cross multiply
    123.37x = 170.17 × 81.90
  4. Step 4: Simplify right side
    123.37x = 13,936.72
  5. Step 5: Solve for x
    x = 13,936.72/123.37
  6. Step 6: Final answer
    x = 112.97

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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.