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Finding the Fourth Proportional to 787.76, 1,181.20 and 267.47

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Solution

The fourth proportional to 787.76, 1,181.20 and 267.47 is: 401.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.76 : 1,181.20 = 267.47 : x
  2. Step 2: Convert to fraction form
    787.76/1,181.20 = 267.47/x
  3. Step 3: Cross multiply
    787.76x = 1,181.20 × 267.47
  4. Step 4: Simplify right side
    787.76x = 315,935.56
  5. Step 5: Solve for x
    x = 315,935.56/787.76
  6. Step 6: Final answer
    x = 401.06

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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.