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Finding the Fourth Proportional to 837.69, 1,255.39 and 398.87

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Solution

The fourth proportional to 837.69, 1,255.39 and 398.87 is: 597.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.69 : 1,255.39 = 398.87 : x
  2. Step 2: Convert to fraction form
    837.69/1,255.39 = 398.87/x
  3. Step 3: Cross multiply
    837.69x = 1,255.39 × 398.87
  4. Step 4: Simplify right side
    837.69x = 500,737.41
  5. Step 5: Solve for x
    x = 500,737.41/837.69
  6. Step 6: Final answer
    x = 597.76

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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.