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Finding the Fourth Proportional to 765.76, 1,147.20 and 441.04

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Solution

The fourth proportional to 765.76, 1,147.20 and 441.04 is: 660.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.76 : 1,147.20 = 441.04 : x
  2. Step 2: Convert to fraction form
    765.76/1,147.20 = 441.04/x
  3. Step 3: Cross multiply
    765.76x = 1,147.20 × 441.04
  4. Step 4: Simplify right side
    765.76x = 505,961.09
  5. Step 5: Solve for x
    x = 505,961.09/765.76
  6. Step 6: Final answer
    x = 660.73

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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.