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Finding the Fourth Proportional to 837.98, 1,255.29 and 399.66

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Solution

The fourth proportional to 837.98, 1,255.29 and 399.66 is: 598.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.98 : 1,255.29 = 399.66 : x
  2. Step 2: Convert to fraction form
    837.98/1,255.29 = 399.66/x
  3. Step 3: Cross multiply
    837.98x = 1,255.29 × 399.66
  4. Step 4: Simplify right side
    837.98x = 501,682.92
  5. Step 5: Solve for x
    x = 501,682.92/837.98
  6. Step 6: Final answer
    x = 598.68

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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.