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Finding the Fourth Proportional to 511.20, 767.28 and 267.90

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Solution

The fourth proportional to 511.20, 767.28 and 267.90 is: 402.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.20 : 767.28 = 267.90 : x
  2. Step 2: Convert to fraction form
    511.20/767.28 = 267.90/x
  3. Step 3: Cross multiply
    511.20x = 767.28 × 267.90
  4. Step 4: Simplify right side
    511.20x = 205,554.31
  5. Step 5: Solve for x
    x = 205,554.31/511.20
  6. Step 6: Final answer
    x = 402.10

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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.