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Finding the Fourth Proportional to 123.88, 171.03 and 77.27

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Solution

The fourth proportional to 123.88, 171.03 and 77.27 is: 106.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.88 : 171.03 = 77.27 : x
  2. Step 2: Convert to fraction form
    123.88/171.03 = 77.27/x
  3. Step 3: Cross multiply
    123.88x = 171.03 × 77.27
  4. Step 4: Simplify right side
    123.88x = 13,215.56
  5. Step 5: Solve for x
    x = 13,215.56/123.88
  6. Step 6: Final answer
    x = 106.68

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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.