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Finding the Fourth Proportional to 801.57, 1,105.36 and 712.79

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Solution

The fourth proportional to 801.57, 1,105.36 and 712.79 is: 982.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.57 : 1,105.36 = 712.79 : x
  2. Step 2: Convert to fraction form
    801.57/1,105.36 = 712.79/x
  3. Step 3: Cross multiply
    801.57x = 1,105.36 × 712.79
  4. Step 4: Simplify right side
    801.57x = 787,882.25
  5. Step 5: Solve for x
    x = 787,882.25/801.57
  6. Step 6: Final answer
    x = 982.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.