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Finding the Fourth Proportional to 921.85, 1,382.78 and 759.20

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Solution

The fourth proportional to 921.85, 1,382.78 and 759.20 is: 1,138.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.85 : 1,382.78 = 759.20 : x
  2. Step 2: Convert to fraction form
    921.85/1,382.78 = 759.20/x
  3. Step 3: Cross multiply
    921.85x = 1,382.78 × 759.20
  4. Step 4: Simplify right side
    921.85x = 1,049,801.56
  5. Step 5: Solve for x
    x = 1,049,801.56/921.85
  6. Step 6: Final answer
    x = 1,138.80

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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.