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Finding the Fourth Proportional to 268.86, 402.78 and 225.42

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Solution

The fourth proportional to 268.86, 402.78 and 225.42 is: 337.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.86 : 402.78 = 225.42 : x
  2. Step 2: Convert to fraction form
    268.86/402.78 = 225.42/x
  3. Step 3: Cross multiply
    268.86x = 402.78 × 225.42
  4. Step 4: Simplify right side
    268.86x = 90,794.67
  5. Step 5: Solve for x
    x = 90,794.67/268.86
  6. Step 6: Final answer
    x = 337.70

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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.