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Finding the Fourth Proportional to 209.79, 315.09 and 149.04

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Solution

The fourth proportional to 209.79, 315.09 and 149.04 is: 223.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.79 : 315.09 = 149.04 : x
  2. Step 2: Convert to fraction form
    209.79/315.09 = 149.04/x
  3. Step 3: Cross multiply
    209.79x = 315.09 × 149.04
  4. Step 4: Simplify right side
    209.79x = 46,961.01
  5. Step 5: Solve for x
    x = 46,961.01/209.79
  6. Step 6: Final answer
    x = 223.85

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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.