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Finding the Fourth Proportional to 86.16, 129.24 and 25.30

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Solution

The fourth proportional to 86.16, 129.24 and 25.30 is: 37.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.16 : 129.24 = 25.30 : x
  2. Step 2: Convert to fraction form
    86.16/129.24 = 25.30/x
  3. Step 3: Cross multiply
    86.16x = 129.24 × 25.30
  4. Step 4: Simplify right side
    86.16x = 3,269.77
  5. Step 5: Solve for x
    x = 3,269.77/86.16
  6. Step 6: Final answer
    x = 37.95

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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.