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Finding the Fourth Proportional to 124.06, 171.14 and 87.20

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Solution

The fourth proportional to 124.06, 171.14 and 87.20 is: 120.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.06 : 171.14 = 87.20 : x
  2. Step 2: Convert to fraction form
    124.06/171.14 = 87.20/x
  3. Step 3: Cross multiply
    124.06x = 171.14 × 87.20
  4. Step 4: Simplify right side
    124.06x = 14,923.41
  5. Step 5: Solve for x
    x = 14,923.41/124.06
  6. Step 6: Final answer
    x = 120.30

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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.