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Finding the Fourth Proportional to 149.24, 205.31 and 121.55

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Solution

The fourth proportional to 149.24, 205.31 and 121.55 is: 167.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.24 : 205.31 = 121.55 : x
  2. Step 2: Convert to fraction form
    149.24/205.31 = 121.55/x
  3. Step 3: Cross multiply
    149.24x = 205.31 × 121.55
  4. Step 4: Simplify right side
    149.24x = 24,955.56
  5. Step 5: Solve for x
    x = 24,955.56/149.24
  6. Step 6: Final answer
    x = 167.21

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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.