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Finding the Fourth Proportional to 363.12, 545.51 and 209.42

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Solution

The fourth proportional to 363.12, 545.51 and 209.42 is: 314.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    363.12 : 545.51 = 209.42 : x
  2. Step 2: Convert to fraction form
    363.12/545.51 = 209.42/x
  3. Step 3: Cross multiply
    363.12x = 545.51 × 209.42
  4. Step 4: Simplify right side
    363.12x = 114,240.55
  5. Step 5: Solve for x
    x = 114,240.55/363.12
  6. Step 6: Final answer
    x = 314.61

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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.