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Finding the Fourth Proportional to 765.57, 1,147.42 and 548.69

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Solution

The fourth proportional to 765.57, 1,147.42 and 548.69 is: 822.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.57 : 1,147.42 = 548.69 : x
  2. Step 2: Convert to fraction form
    765.57/1,147.42 = 548.69/x
  3. Step 3: Cross multiply
    765.57x = 1,147.42 × 548.69
  4. Step 4: Simplify right side
    765.57x = 629,577.88
  5. Step 5: Solve for x
    x = 629,577.88/765.57
  6. Step 6: Final answer
    x = 822.36

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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.