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Finding the Fourth Proportional to 865.98, 1,299.15 and 318.17

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Solution

The fourth proportional to 865.98, 1,299.15 and 318.17 is: 477.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.98 : 1,299.15 = 318.17 : x
  2. Step 2: Convert to fraction form
    865.98/1,299.15 = 318.17/x
  3. Step 3: Cross multiply
    865.98x = 1,299.15 × 318.17
  4. Step 4: Simplify right side
    865.98x = 413,344.06
  5. Step 5: Solve for x
    x = 413,344.06/865.98
  6. Step 6: Final answer
    x = 477.31

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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.