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Finding the Fourth Proportional to 342.20, 512.70 and 294.20

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Solution

The fourth proportional to 342.20, 512.70 and 294.20 is: 440.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.20 : 512.70 = 294.20 : x
  2. Step 2: Convert to fraction form
    342.20/512.70 = 294.20/x
  3. Step 3: Cross multiply
    342.20x = 512.70 × 294.20
  4. Step 4: Simplify right side
    342.20x = 150,836.34
  5. Step 5: Solve for x
    x = 150,836.34/342.20
  6. Step 6: Final answer
    x = 440.78

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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.