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Finding the Fourth Proportional to 209.90, 315.31 and 149.42

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Solution

The fourth proportional to 209.90, 315.31 and 149.42 is: 224.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.90 : 315.31 = 149.42 : x
  2. Step 2: Convert to fraction form
    209.90/315.31 = 149.42/x
  3. Step 3: Cross multiply
    209.90x = 315.31 × 149.42
  4. Step 4: Simplify right side
    209.90x = 47,113.62
  5. Step 5: Solve for x
    x = 47,113.62/209.90
  6. Step 6: Final answer
    x = 224.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.