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Finding the Fourth Proportional to 787.46, 1,086.70 and 492.90

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Solution

The fourth proportional to 787.46, 1,086.70 and 492.90 is: 680.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.46 : 1,086.70 = 492.90 : x
  2. Step 2: Convert to fraction form
    787.46/1,086.70 = 492.90/x
  3. Step 3: Cross multiply
    787.46x = 1,086.70 × 492.90
  4. Step 4: Simplify right side
    787.46x = 535,634.43
  5. Step 5: Solve for x
    x = 535,634.43/787.46
  6. Step 6: Final answer
    x = 680.21

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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.