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Finding the Fourth Proportional to 838.22, 1,257.39 and 318.47

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Solution

The fourth proportional to 838.22, 1,257.39 and 318.47 is: 477.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.22 : 1,257.39 = 318.47 : x
  2. Step 2: Convert to fraction form
    838.22/1,257.39 = 318.47/x
  3. Step 3: Cross multiply
    838.22x = 1,257.39 × 318.47
  4. Step 4: Simplify right side
    838.22x = 400,434.71
  5. Step 5: Solve for x
    x = 400,434.71/838.22
  6. Step 6: Final answer
    x = 477.72

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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.