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Finding the Fourth Proportional to 86.24, 129.38 and 38.18

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Solution

The fourth proportional to 86.24, 129.38 and 38.18 is: 57.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.24 : 129.38 = 38.18 : x
  2. Step 2: Convert to fraction form
    86.24/129.38 = 38.18/x
  3. Step 3: Cross multiply
    86.24x = 129.38 × 38.18
  4. Step 4: Simplify right side
    86.24x = 4,939.66
  5. Step 5: Solve for x
    x = 4,939.66/86.24
  6. Step 6: Final answer
    x = 57.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.