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Finding the Fourth Proportional to 86.92, 130.40 and 29.15

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Solution

The fourth proportional to 86.92, 130.40 and 29.15 is: 43.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.92 : 130.40 = 29.15 : x
  2. Step 2: Convert to fraction form
    86.92/130.40 = 29.15/x
  3. Step 3: Cross multiply
    86.92x = 130.40 × 29.15
  4. Step 4: Simplify right side
    86.92x = 3,800.85
  5. Step 5: Solve for x
    x = 3,800.85/86.92
  6. Step 6: Final answer
    x = 43.73

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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.