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Finding the Fourth Proportional to 865.19, 1,298.16 and 371.75

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Solution

The fourth proportional to 865.19, 1,298.16 and 371.75 is: 557.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.19 : 1,298.16 = 371.75 : x
  2. Step 2: Convert to fraction form
    865.19/1,298.16 = 371.75/x
  3. Step 3: Cross multiply
    865.19x = 1,298.16 × 371.75
  4. Step 4: Simplify right side
    865.19x = 482,584.49
  5. Step 5: Solve for x
    x = 482,584.49/865.19
  6. Step 6: Final answer
    x = 557.78

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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.