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Finding the Fourth Proportional to 511.52, 767.78 and 268.21

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Solution

The fourth proportional to 511.52, 767.78 and 268.21 is: 402.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.52 : 767.78 = 268.21 : x
  2. Step 2: Convert to fraction form
    511.52/767.78 = 268.21/x
  3. Step 3: Cross multiply
    511.52x = 767.78 × 268.21
  4. Step 4: Simplify right side
    511.52x = 205,926.90
  5. Step 5: Solve for x
    x = 205,926.90/511.52
  6. Step 6: Final answer
    x = 402.58

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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.