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Finding the Fourth Proportional to 86.87, 130.31 and 43.62

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Solution

The fourth proportional to 86.87, 130.31 and 43.62 is: 65.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.87 : 130.31 = 43.62 : x
  2. Step 2: Convert to fraction form
    86.87/130.31 = 43.62/x
  3. Step 3: Cross multiply
    86.87x = 130.31 × 43.62
  4. Step 4: Simplify right side
    86.87x = 5,684.12
  5. Step 5: Solve for x
    x = 5,684.12/86.87
  6. Step 6: Final answer
    x = 65.43

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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.