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Finding the Fourth Proportional to 225.90, 338.40 and 209.70

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Solution

The fourth proportional to 225.90, 338.40 and 209.70 is: 314.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.90 : 338.40 = 209.70 : x
  2. Step 2: Convert to fraction form
    225.90/338.40 = 209.70/x
  3. Step 3: Cross multiply
    225.90x = 338.40 × 209.70
  4. Step 4: Simplify right side
    225.90x = 70,962.48
  5. Step 5: Solve for x
    x = 70,962.48/225.90
  6. Step 6: Final answer
    x = 314.13

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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.