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Finding the Fourth Proportional to 221.52, 303.90 and 209.10

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Solution

The fourth proportional to 221.52, 303.90 and 209.10 is: 286.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.52 : 303.90 = 209.10 : x
  2. Step 2: Convert to fraction form
    221.52/303.90 = 209.10/x
  3. Step 3: Cross multiply
    221.52x = 303.90 × 209.10
  4. Step 4: Simplify right side
    221.52x = 63,545.49
  5. Step 5: Solve for x
    x = 63,545.49/221.52
  6. Step 6: Final answer
    x = 286.86

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.