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Finding the Fourth Proportional to 124.65, 171.96 and 74.85

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Solution

The fourth proportional to 124.65, 171.96 and 74.85 is: 103.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.65 : 171.96 = 74.85 : x
  2. Step 2: Convert to fraction form
    124.65/171.96 = 74.85/x
  3. Step 3: Cross multiply
    124.65x = 171.96 × 74.85
  4. Step 4: Simplify right side
    124.65x = 12,871.21
  5. Step 5: Solve for x
    x = 12,871.21/124.65
  6. Step 6: Final answer
    x = 103.26

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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.