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Finding the Fourth Proportional to 801.28, 1,105.76 and 690.56

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Solution

The fourth proportional to 801.28, 1,105.76 and 690.56 is: 952.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.28 : 1,105.76 = 690.56 : x
  2. Step 2: Convert to fraction form
    801.28/1,105.76 = 690.56/x
  3. Step 3: Cross multiply
    801.28x = 1,105.76 × 690.56
  4. Step 4: Simplify right side
    801.28x = 763,593.63
  5. Step 5: Solve for x
    x = 763,593.63/801.28
  6. Step 6: Final answer
    x = 952.97

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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.