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Finding the Fourth Proportional to 515.28, 772.82 and 255.20

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Solution

The fourth proportional to 515.28, 772.82 and 255.20 is: 382.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.28 : 772.82 = 255.20 : x
  2. Step 2: Convert to fraction form
    515.28/772.82 = 255.20/x
  3. Step 3: Cross multiply
    515.28x = 772.82 × 255.20
  4. Step 4: Simplify right side
    515.28x = 197,220.92
  5. Step 5: Solve for x
    x = 197,220.92/515.28
  6. Step 6: Final answer
    x = 382.75

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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.