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Finding the Fourth Proportional to 149.24, 206.04 and 138.85

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Solution

The fourth proportional to 149.24, 206.04 and 138.85 is: 191.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.24 : 206.04 = 138.85 : x
  2. Step 2: Convert to fraction form
    149.24/206.04 = 138.85/x
  3. Step 3: Cross multiply
    149.24x = 206.04 × 138.85
  4. Step 4: Simplify right side
    149.24x = 28,608.66
  5. Step 5: Solve for x
    x = 28,608.66/149.24
  6. Step 6: Final answer
    x = 191.69

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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.