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Finding the Fourth Proportional to 728.52, 1,091.72 and 362.78

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Solution

The fourth proportional to 728.52, 1,091.72 and 362.78 is: 543.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.52 : 1,091.72 = 362.78 : x
  2. Step 2: Convert to fraction form
    728.52/1,091.72 = 362.78/x
  3. Step 3: Cross multiply
    728.52x = 1,091.72 × 362.78
  4. Step 4: Simplify right side
    728.52x = 396,054.18
  5. Step 5: Solve for x
    x = 396,054.18/728.52
  6. Step 6: Final answer
    x = 543.64

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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.