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Finding the Fourth Proportional to 865.57, 1,297.89 and 378.05

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Solution

The fourth proportional to 865.57, 1,297.89 and 378.05 is: 566.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.57 : 1,297.89 = 378.05 : x
  2. Step 2: Convert to fraction form
    865.57/1,297.89 = 378.05/x
  3. Step 3: Cross multiply
    865.57x = 1,297.89 × 378.05
  4. Step 4: Simplify right side
    865.57x = 490,667.31
  5. Step 5: Solve for x
    x = 490,667.31/865.57
  6. Step 6: Final answer
    x = 566.88

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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.