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Finding the Fourth Proportional to 209.88, 315.17 and 149.23

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Solution

The fourth proportional to 209.88, 315.17 and 149.23 is: 224.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.88 : 315.17 = 149.23 : x
  2. Step 2: Convert to fraction form
    209.88/315.17 = 149.23/x
  3. Step 3: Cross multiply
    209.88x = 315.17 × 149.23
  4. Step 4: Simplify right side
    209.88x = 47,032.82
  5. Step 5: Solve for x
    x = 47,032.82/209.88
  6. Step 6: Final answer
    x = 224.09

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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.