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Finding the Fourth Proportional to 865.20, 1,193.88 and 690.48

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Solution

The fourth proportional to 865.20, 1,193.88 and 690.48 is: 952.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.20 : 1,193.88 = 690.48 : x
  2. Step 2: Convert to fraction form
    865.20/1,193.88 = 690.48/x
  3. Step 3: Cross multiply
    865.20x = 1,193.88 × 690.48
  4. Step 4: Simplify right side
    865.20x = 824,350.26
  5. Step 5: Solve for x
    x = 824,350.26/865.20
  6. Step 6: Final answer
    x = 952.79

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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.