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Finding the Fourth Proportional to 123.95, 171.18 and 80.42

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Solution

The fourth proportional to 123.95, 171.18 and 80.42 is: 111.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.95 : 171.18 = 80.42 : x
  2. Step 2: Convert to fraction form
    123.95/171.18 = 80.42/x
  3. Step 3: Cross multiply
    123.95x = 171.18 × 80.42
  4. Step 4: Simplify right side
    123.95x = 13,765.44
  5. Step 5: Solve for x
    x = 13,765.44/123.95
  6. Step 6: Final answer
    x = 111.05

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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.