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Finding the Fourth Proportional to 106.86, 147.42 and 84.90

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Solution

The fourth proportional to 106.86, 147.42 and 84.90 is: 117.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.86 : 147.42 = 84.90 : x
  2. Step 2: Convert to fraction form
    106.86/147.42 = 84.90/x
  3. Step 3: Cross multiply
    106.86x = 147.42 × 84.90
  4. Step 4: Simplify right side
    106.86x = 12,515.96
  5. Step 5: Solve for x
    x = 12,515.96/106.86
  6. Step 6: Final answer
    x = 117.12

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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.