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Finding the Fourth Proportional to 728.10, 1,091.84 and 265.73

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Solution

The fourth proportional to 728.10, 1,091.84 and 265.73 is: 398.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.10 : 1,091.84 = 265.73 : x
  2. Step 2: Convert to fraction form
    728.10/1,091.84 = 265.73/x
  3. Step 3: Cross multiply
    728.10x = 1,091.84 × 265.73
  4. Step 4: Simplify right side
    728.10x = 290,127.86
  5. Step 5: Solve for x
    x = 290,127.86/728.10
  6. Step 6: Final answer
    x = 398.47

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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.