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Finding the Fourth Proportional to 838.40, 1,257.06 and 426.97

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Solution

The fourth proportional to 838.40, 1,257.06 and 426.97 is: 640.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.40 : 1,257.06 = 426.97 : x
  2. Step 2: Convert to fraction form
    838.40/1,257.06 = 426.97/x
  3. Step 3: Cross multiply
    838.40x = 1,257.06 × 426.97
  4. Step 4: Simplify right side
    838.40x = 536,726.91
  5. Step 5: Solve for x
    x = 536,726.91/838.40
  6. Step 6: Final answer
    x = 640.18

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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.