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Finding the Fourth Proportional to 124.08, 171.42 and 87.18

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Solution

The fourth proportional to 124.08, 171.42 and 87.18 is: 120.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.08 : 171.42 = 87.18 : x
  2. Step 2: Convert to fraction form
    124.08/171.42 = 87.18/x
  3. Step 3: Cross multiply
    124.08x = 171.42 × 87.18
  4. Step 4: Simplify right side
    124.08x = 14,943.43
  5. Step 5: Solve for x
    x = 14,943.43/124.08
  6. Step 6: Final answer
    x = 120.43

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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.