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Finding the Fourth Proportional to 838.06, 1,256 and 426.85

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Solution

The fourth proportional to 838.06, 1,256 and 426.85 is: 639.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.06 : 1,256 = 426.85 : x
  2. Step 2: Convert to fraction form
    838.06/1,256 = 426.85/x
  3. Step 3: Cross multiply
    838.06x = 1,256 × 426.85
  4. Step 4: Simplify right side
    838.06x = 536,123.60
  5. Step 5: Solve for x
    x = 536,123.60/838.06
  6. Step 6: Final answer
    x = 639.72

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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.