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Finding the Fourth Proportional to 149.32, 205.66 and 138.69

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Solution

The fourth proportional to 149.32, 205.66 and 138.69 is: 191.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.32 : 205.66 = 138.69 : x
  2. Step 2: Convert to fraction form
    149.32/205.66 = 138.69/x
  3. Step 3: Cross multiply
    149.32x = 205.66 × 138.69
  4. Step 4: Simplify right side
    149.32x = 28,522.99
  5. Step 5: Solve for x
    x = 28,522.99/149.32
  6. Step 6: Final answer
    x = 191.02

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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.