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Finding the Fourth Proportional to 787.72, 1,086.98 and 456.17

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Solution

The fourth proportional to 787.72, 1,086.98 and 456.17 is: 629.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.72 : 1,086.98 = 456.17 : x
  2. Step 2: Convert to fraction form
    787.72/1,086.98 = 456.17/x
  3. Step 3: Cross multiply
    787.72x = 1,086.98 × 456.17
  4. Step 4: Simplify right side
    787.72x = 495,847.45
  5. Step 5: Solve for x
    x = 495,847.45/787.72
  6. Step 6: Final answer
    x = 629.47

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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.