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Finding the Fourth Proportional to 439.27, 606.20 and 242.78

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Solution

The fourth proportional to 439.27, 606.20 and 242.78 is: 335.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.27 : 606.20 = 242.78 : x
  2. Step 2: Convert to fraction form
    439.27/606.20 = 242.78/x
  3. Step 3: Cross multiply
    439.27x = 606.20 × 242.78
  4. Step 4: Simplify right side
    439.27x = 147,173.84
  5. Step 5: Solve for x
    x = 147,173.84/439.27
  6. Step 6: Final answer
    x = 335.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.