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Finding the Fourth Proportional to 865.28, 1,297.92 and 378.37

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Solution

The fourth proportional to 865.28, 1,297.92 and 378.37 is: 567.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.28 : 1,297.92 = 378.37 : x
  2. Step 2: Convert to fraction form
    865.28/1,297.92 = 378.37/x
  3. Step 3: Cross multiply
    865.28x = 1,297.92 × 378.37
  4. Step 4: Simplify right side
    865.28x = 491,085.61
  5. Step 5: Solve for x
    x = 491,085.61/865.28
  6. Step 6: Final answer
    x = 567.55

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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.