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Finding the Fourth Proportional to 838.67, 1,257.74 and 351.63

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Solution

The fourth proportional to 838.67, 1,257.74 and 351.63 is: 527.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.67 : 1,257.74 = 351.63 : x
  2. Step 2: Convert to fraction form
    838.67/1,257.74 = 351.63/x
  3. Step 3: Cross multiply
    838.67x = 1,257.74 × 351.63
  4. Step 4: Simplify right side
    838.67x = 442,257.36
  5. Step 5: Solve for x
    x = 442,257.36/838.67
  6. Step 6: Final answer
    x = 527.33

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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.