Home / 1,517.20-2,272.40-787.44

Finding the Fourth Proportional to 1,517.20, 2,272.40 and 787.44

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Solution

The fourth proportional to 1,517.20, 2,272.40 and 787.44 is: 1,179.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,517.20 : 2,272.40 = 787.44 : x
  2. Step 2: Convert to fraction form
    1,517.20/2,272.40 = 787.44/x
  3. Step 3: Cross multiply
    1,517.20x = 2,272.40 × 787.44
  4. Step 4: Simplify right side
    1,517.20x = 1,789,378.66
  5. Step 5: Solve for x
    x = 1,789,378.66/1,517.20
  6. Step 6: Final answer
    x = 1,179.40

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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.