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Finding the Fourth Proportional to 149.25, 206.81 and 140.11

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Solution

The fourth proportional to 149.25, 206.81 and 140.11 is: 194.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.25 : 206.81 = 140.11 : x
  2. Step 2: Convert to fraction form
    149.25/206.81 = 140.11/x
  3. Step 3: Cross multiply
    149.25x = 206.81 × 140.11
  4. Step 4: Simplify right side
    149.25x = 28,975.80
  5. Step 5: Solve for x
    x = 28,975.80/149.25
  6. Step 6: Final answer
    x = 194.15

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.