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Finding the Fourth Proportional to 838.43, 1,257.65 and 318.43

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Solution

The fourth proportional to 838.43, 1,257.65 and 318.43 is: 477.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.43 : 1,257.65 = 318.43 : x
  2. Step 2: Convert to fraction form
    838.43/1,257.65 = 318.43/x
  3. Step 3: Cross multiply
    838.43x = 1,257.65 × 318.43
  4. Step 4: Simplify right side
    838.43x = 400,473.49
  5. Step 5: Solve for x
    x = 400,473.49/838.43
  6. Step 6: Final answer
    x = 477.65

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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.