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Finding the Fourth Proportional to 515.65, 773.11 and 255.33

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Solution

The fourth proportional to 515.65, 773.11 and 255.33 is: 382.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.65 : 773.11 = 255.33 : x
  2. Step 2: Convert to fraction form
    515.65/773.11 = 255.33/x
  3. Step 3: Cross multiply
    515.65x = 773.11 × 255.33
  4. Step 4: Simplify right side
    515.65x = 197,398.50
  5. Step 5: Solve for x
    x = 197,398.50/515.65
  6. Step 6: Final answer
    x = 382.82

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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.