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Finding the Fourth Proportional to 764.80, 1,147.36 and 572.56

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Solution

The fourth proportional to 764.80, 1,147.36 and 572.56 is: 858.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.80 : 1,147.36 = 572.56 : x
  2. Step 2: Convert to fraction form
    764.80/1,147.36 = 572.56/x
  3. Step 3: Cross multiply
    764.80x = 1,147.36 × 572.56
  4. Step 4: Simplify right side
    764.80x = 656,932.44
  5. Step 5: Solve for x
    x = 656,932.44/764.80
  6. Step 6: Final answer
    x = 858.96

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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.