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Finding the Fourth Proportional to 787.30, 1,086.68 and 455.92

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Solution

The fourth proportional to 787.30, 1,086.68 and 455.92 is: 629.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.30 : 1,086.68 = 455.92 : x
  2. Step 2: Convert to fraction form
    787.30/1,086.68 = 455.92/x
  3. Step 3: Cross multiply
    787.30x = 1,086.68 × 455.92
  4. Step 4: Simplify right side
    787.30x = 495,439.15
  5. Step 5: Solve for x
    x = 495,439.15/787.30
  6. Step 6: Final answer
    x = 629.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.