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Finding the Fourth Proportional to 838.27, 1,257.09 and 318.00

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Solution

The fourth proportional to 838.27, 1,257.09 and 318.00 is: 476.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.27 : 1,257.09 = 318.00 : x
  2. Step 2: Convert to fraction form
    838.27/1,257.09 = 318.00/x
  3. Step 3: Cross multiply
    838.27x = 1,257.09 × 318.00
  4. Step 4: Simplify right side
    838.27x = 399,757.29
  5. Step 5: Solve for x
    x = 399,757.29/838.27
  6. Step 6: Final answer
    x = 476.88

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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.