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Finding the Fourth Proportional to 515.75, 772.20 and 268.43

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Solution

The fourth proportional to 515.75, 772.20 and 268.43 is: 401.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.75 : 772.20 = 268.43 : x
  2. Step 2: Convert to fraction form
    515.75/772.20 = 268.43/x
  3. Step 3: Cross multiply
    515.75x = 772.20 × 268.43
  4. Step 4: Simplify right side
    515.75x = 207,281.65
  5. Step 5: Solve for x
    x = 207,281.65/515.75
  6. Step 6: Final answer
    x = 401.90

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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.