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Finding the Fourth Proportional to 149.50, 205.38 and 126.15

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Solution

The fourth proportional to 149.50, 205.38 and 126.15 is: 173.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.50 : 205.38 = 126.15 : x
  2. Step 2: Convert to fraction form
    149.50/205.38 = 126.15/x
  3. Step 3: Cross multiply
    149.50x = 205.38 × 126.15
  4. Step 4: Simplify right side
    149.50x = 25,908.69
  5. Step 5: Solve for x
    x = 25,908.69/149.50
  6. Step 6: Final answer
    x = 173.30

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.