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Finding the Fourth Proportional to 787.31, 1,181.12 and 267.28

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Solution

The fourth proportional to 787.31, 1,181.12 and 267.28 is: 400.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.31 : 1,181.12 = 267.28 : x
  2. Step 2: Convert to fraction form
    787.31/1,181.12 = 267.28/x
  3. Step 3: Cross multiply
    787.31x = 1,181.12 × 267.28
  4. Step 4: Simplify right side
    787.31x = 315,687.47
  5. Step 5: Solve for x
    x = 315,687.47/787.31
  6. Step 6: Final answer
    x = 400.97

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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.