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Finding the Fourth Proportional to 837.41, 1,256.85 and 426.80

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Solution

The fourth proportional to 837.41, 1,256.85 and 426.80 is: 640.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.41 : 1,256.85 = 426.80 : x
  2. Step 2: Convert to fraction form
    837.41/1,256.85 = 426.80/x
  3. Step 3: Cross multiply
    837.41x = 1,256.85 × 426.80
  4. Step 4: Simplify right side
    837.41x = 536,426.72
  5. Step 5: Solve for x
    x = 536,426.72/837.41
  6. Step 6: Final answer
    x = 640.58

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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.