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Finding the Fourth Proportional to 106.91, 160.28 and 61.28

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Solution

The fourth proportional to 106.91, 160.28 and 61.28 is: 91.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.91 : 160.28 = 61.28 : x
  2. Step 2: Convert to fraction form
    106.91/160.28 = 61.28/x
  3. Step 3: Cross multiply
    106.91x = 160.28 × 61.28
  4. Step 4: Simplify right side
    106.91x = 9,820.85
  5. Step 5: Solve for x
    x = 9,820.85/106.91
  6. Step 6: Final answer
    x = 91.87

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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.