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Finding the Fourth Proportional to 106.26, 159.21 and 84.66

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Solution

The fourth proportional to 106.26, 159.21 and 84.66 is: 126.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.26 : 159.21 = 84.66 : x
  2. Step 2: Convert to fraction form
    106.26/159.21 = 84.66/x
  3. Step 3: Cross multiply
    106.26x = 159.21 × 84.66
  4. Step 4: Simplify right side
    106.26x = 13,478.72
  5. Step 5: Solve for x
    x = 13,478.72/106.26
  6. Step 6: Final answer
    x = 126.85

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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.