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Finding the Fourth Proportional to 124.11, 171.16 and 87.25

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Solution

The fourth proportional to 124.11, 171.16 and 87.25 is: 120.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.11 : 171.16 = 87.25 : x
  2. Step 2: Convert to fraction form
    124.11/171.16 = 87.25/x
  3. Step 3: Cross multiply
    124.11x = 171.16 × 87.25
  4. Step 4: Simplify right side
    124.11x = 14,933.71
  5. Step 5: Solve for x
    x = 14,933.71/124.11
  6. Step 6: Final answer
    x = 120.33

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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.