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Finding the Fourth Proportional to 512.70, 769.14 and 252.78

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Solution

The fourth proportional to 512.70, 769.14 and 252.78 is: 379.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.70 : 769.14 = 252.78 : x
  2. Step 2: Convert to fraction form
    512.70/769.14 = 252.78/x
  3. Step 3: Cross multiply
    512.70x = 769.14 × 252.78
  4. Step 4: Simplify right side
    512.70x = 194,423.21
  5. Step 5: Solve for x
    x = 194,423.21/512.70
  6. Step 6: Final answer
    x = 379.21

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Double scale
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Similar ratio
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1.5x scale

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.