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Finding the Fourth Proportional to 123.96, 170.66 and 115.79

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Solution

The fourth proportional to 123.96, 170.66 and 115.79 is: 159.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.96 : 170.66 = 115.79 : x
  2. Step 2: Convert to fraction form
    123.96/170.66 = 115.79/x
  3. Step 3: Cross multiply
    123.96x = 170.66 × 115.79
  4. Step 4: Simplify right side
    123.96x = 19,760.72
  5. Step 5: Solve for x
    x = 19,760.72/123.96
  6. Step 6: Final answer
    x = 159.41

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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.