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Finding the Fourth Proportional to 838.28, 1,257.47 and 253.25

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Solution

The fourth proportional to 838.28, 1,257.47 and 253.25 is: 379.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.28 : 1,257.47 = 253.25 : x
  2. Step 2: Convert to fraction form
    838.28/1,257.47 = 253.25/x
  3. Step 3: Cross multiply
    838.28x = 1,257.47 × 253.25
  4. Step 4: Simplify right side
    838.28x = 318,446.72
  5. Step 5: Solve for x
    x = 318,446.72/838.28
  6. Step 6: Final answer
    x = 379.88

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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.