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Finding the Fourth Proportional to 728.46, 1,087.81 and 572.64

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Solution

The fourth proportional to 728.46, 1,087.81 and 572.64 is: 855.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.46 : 1,087.81 = 572.64 : x
  2. Step 2: Convert to fraction form
    728.46/1,087.81 = 572.64/x
  3. Step 3: Cross multiply
    728.46x = 1,087.81 × 572.64
  4. Step 4: Simplify right side
    728.46x = 622,921.23
  5. Step 5: Solve for x
    x = 622,921.23/728.46
  6. Step 6: Final answer
    x = 855.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.