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Finding the Fourth Proportional to 96.43, 145.31 and 86.81

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Solution

The fourth proportional to 96.43, 145.31 and 86.81 is: 130.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.43 : 145.31 = 86.81 : x
  2. Step 2: Convert to fraction form
    96.43/145.31 = 86.81/x
  3. Step 3: Cross multiply
    96.43x = 145.31 × 86.81
  4. Step 4: Simplify right side
    96.43x = 12,613.63
  5. Step 5: Solve for x
    x = 12,613.63/96.43
  6. Step 6: Final answer
    x = 130.81

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.