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Finding the Fourth Proportional to 86.16, 129.24 and 37.44

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Solution

The fourth proportional to 86.16, 129.24 and 37.44 is: 56.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.16 : 129.24 = 37.44 : x
  2. Step 2: Convert to fraction form
    86.16/129.24 = 37.44/x
  3. Step 3: Cross multiply
    86.16x = 129.24 × 37.44
  4. Step 4: Simplify right side
    86.16x = 4,838.75
  5. Step 5: Solve for x
    x = 4,838.75/86.16
  6. Step 6: Final answer
    x = 56.16

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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.