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Finding the Fourth Proportional to 728.18, 1,092.76 and 343.46

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Solution

The fourth proportional to 728.18, 1,092.76 and 343.46 is: 515.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.18 : 1,092.76 = 343.46 : x
  2. Step 2: Convert to fraction form
    728.18/1,092.76 = 343.46/x
  3. Step 3: Cross multiply
    728.18x = 1,092.76 × 343.46
  4. Step 4: Simplify right side
    728.18x = 375,319.35
  5. Step 5: Solve for x
    x = 375,319.35/728.18
  6. Step 6: Final answer
    x = 515.42

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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.