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Finding the Fourth Proportional to 123.92, 171.06 and 85.16

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Solution

The fourth proportional to 123.92, 171.06 and 85.16 is: 117.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.92 : 171.06 = 85.16 : x
  2. Step 2: Convert to fraction form
    123.92/171.06 = 85.16/x
  3. Step 3: Cross multiply
    123.92x = 171.06 × 85.16
  4. Step 4: Simplify right side
    123.92x = 14,567.47
  5. Step 5: Solve for x
    x = 14,567.47/123.92
  6. Step 6: Final answer
    x = 117.56

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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.