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Finding the Fourth Proportional to 96.91, 133.71 and 61.87

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Solution

The fourth proportional to 96.91, 133.71 and 61.87 is: 85.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.91 : 133.71 = 61.87 : x
  2. Step 2: Convert to fraction form
    96.91/133.71 = 61.87/x
  3. Step 3: Cross multiply
    96.91x = 133.71 × 61.87
  4. Step 4: Simplify right side
    96.91x = 8,272.33
  5. Step 5: Solve for x
    x = 8,272.33/96.91
  6. Step 6: Final answer
    x = 85.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.