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Finding the Fourth Proportional to 748.34, 1,121.67 and 539.90

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Solution

The fourth proportional to 748.34, 1,121.67 and 539.90 is: 809.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.34 : 1,121.67 = 539.90 : x
  2. Step 2: Convert to fraction form
    748.34/1,121.67 = 539.90/x
  3. Step 3: Cross multiply
    748.34x = 1,121.67 × 539.90
  4. Step 4: Simplify right side
    748.34x = 605,589.63
  5. Step 5: Solve for x
    x = 605,589.63/748.34
  6. Step 6: Final answer
    x = 809.24

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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.