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Finding the Fourth Proportional to 106.24, 160.12 and 85

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Solution

The fourth proportional to 106.24, 160.12 and 85 is: 128.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.24 : 160.12 = 85 : x
  2. Step 2: Convert to fraction form
    106.24/160.12 = 85/x
  3. Step 3: Cross multiply
    106.24x = 160.12 × 85
  4. Step 4: Simplify right side
    106.24x = 13,610.20
  5. Step 5: Solve for x
    x = 13,610.20/106.24
  6. Step 6: Final answer
    x = 128.11

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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.