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Finding the Fourth Proportional to 124.89, 171.57 and 111.95

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Solution

The fourth proportional to 124.89, 171.57 and 111.95 is: 153.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.89 : 171.57 = 111.95 : x
  2. Step 2: Convert to fraction form
    124.89/171.57 = 111.95/x
  3. Step 3: Cross multiply
    124.89x = 171.57 × 111.95
  4. Step 4: Simplify right side
    124.89x = 19,207.26
  5. Step 5: Solve for x
    x = 19,207.26/124.89
  6. Step 6: Final answer
    x = 153.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.