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Finding the Fourth Proportional to 96.28, 145.13 and 90.71

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Solution

The fourth proportional to 96.28, 145.13 and 90.71 is: 136.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.28 : 145.13 = 90.71 : x
  2. Step 2: Convert to fraction form
    96.28/145.13 = 90.71/x
  3. Step 3: Cross multiply
    96.28x = 145.13 × 90.71
  4. Step 4: Simplify right side
    96.28x = 13,163.56
  5. Step 5: Solve for x
    x = 13,163.56/96.28
  6. Step 6: Final answer
    x = 136.73

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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.