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Finding the Fourth Proportional to 728.54, 1,091.28 and 481.28

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Solution

The fourth proportional to 728.54, 1,091.28 and 481.28 is: 720.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.54 : 1,091.28 = 481.28 : x
  2. Step 2: Convert to fraction form
    728.54/1,091.28 = 481.28/x
  3. Step 3: Cross multiply
    728.54x = 1,091.28 × 481.28
  4. Step 4: Simplify right side
    728.54x = 525,211.24
  5. Step 5: Solve for x
    x = 525,211.24/728.54
  6. Step 6: Final answer
    x = 720.91

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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.