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Finding the Fourth Proportional to 149.50, 206.22 and 138.57

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Solution

The fourth proportional to 149.50, 206.22 and 138.57 is: 191.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.50 : 206.22 = 138.57 : x
  2. Step 2: Convert to fraction form
    149.50/206.22 = 138.57/x
  3. Step 3: Cross multiply
    149.50x = 206.22 × 138.57
  4. Step 4: Simplify right side
    149.50x = 28,575.91
  5. Step 5: Solve for x
    x = 28,575.91/149.50
  6. Step 6: Final answer
    x = 191.14

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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.