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Finding the Fourth Proportional to 837.36, 1,255.52 and 398.74

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Solution

The fourth proportional to 837.36, 1,255.52 and 398.74 is: 597.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.36 : 1,255.52 = 398.74 : x
  2. Step 2: Convert to fraction form
    837.36/1,255.52 = 398.74/x
  3. Step 3: Cross multiply
    837.36x = 1,255.52 × 398.74
  4. Step 4: Simplify right side
    837.36x = 500,626.04
  5. Step 5: Solve for x
    x = 500,626.04/837.36
  6. Step 6: Final answer
    x = 597.86

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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.