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Finding the Fourth Proportional to 123.23, 169.86 and 86.31

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Solution

The fourth proportional to 123.23, 169.86 and 86.31 is: 118.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.23 : 169.86 = 86.31 : x
  2. Step 2: Convert to fraction form
    123.23/169.86 = 86.31/x
  3. Step 3: Cross multiply
    123.23x = 169.86 × 86.31
  4. Step 4: Simplify right side
    123.23x = 14,660.62
  5. Step 5: Solve for x
    x = 14,660.62/123.23
  6. Step 6: Final answer
    x = 118.97

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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.