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Finding the Fourth Proportional to 787.32, 1,179.45 and 494.10

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Solution

The fourth proportional to 787.32, 1,179.45 and 494.10 is: 740.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.32 : 1,179.45 = 494.10 : x
  2. Step 2: Convert to fraction form
    787.32/1,179.45 = 494.10/x
  3. Step 3: Cross multiply
    787.32x = 1,179.45 × 494.10
  4. Step 4: Simplify right side
    787.32x = 582,766.25
  5. Step 5: Solve for x
    x = 582,766.25/787.32
  6. Step 6: Final answer
    x = 740.19

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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.