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Finding the Fourth Proportional to 934.62, 1,399.20 and 728.56

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Solution

The fourth proportional to 934.62, 1,399.20 and 728.56 is: 1,090.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.62 : 1,399.20 = 728.56 : x
  2. Step 2: Convert to fraction form
    934.62/1,399.20 = 728.56/x
  3. Step 3: Cross multiply
    934.62x = 1,399.20 × 728.56
  4. Step 4: Simplify right side
    934.62x = 1,019,394.16
  5. Step 5: Solve for x
    x = 1,019,394.16/934.62
  6. Step 6: Final answer
    x = 1,090.71

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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.