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Finding the Fourth Proportional to 837.41, 1,256.85 and 399.20

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Solution

The fourth proportional to 837.41, 1,256.85 and 399.20 is: 599.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.41 : 1,256.85 = 399.20 : x
  2. Step 2: Convert to fraction form
    837.41/1,256.85 = 399.20/x
  3. Step 3: Cross multiply
    837.41x = 1,256.85 × 399.20
  4. Step 4: Simplify right side
    837.41x = 501,728.24
  5. Step 5: Solve for x
    x = 501,728.24/837.41
  6. Step 6: Final answer
    x = 599.15

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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.