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Finding the Fourth Proportional to 124.55, 171.75 and 87.65

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Solution

The fourth proportional to 124.55, 171.75 and 87.65 is: 120.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.55 : 171.75 = 87.65 : x
  2. Step 2: Convert to fraction form
    124.55/171.75 = 87.65/x
  3. Step 3: Cross multiply
    124.55x = 171.75 × 87.65
  4. Step 4: Simplify right side
    124.55x = 15,053.89
  5. Step 5: Solve for x
    x = 15,053.89/124.55
  6. Step 6: Final answer
    x = 120.87

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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.