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Finding the Fourth Proportional to 836.79, 1,255.16 and 398.36

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Solution

The fourth proportional to 836.79, 1,255.16 and 398.36 is: 597.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.79 : 1,255.16 = 398.36 : x
  2. Step 2: Convert to fraction form
    836.79/1,255.16 = 398.36/x
  3. Step 3: Cross multiply
    836.79x = 1,255.16 × 398.36
  4. Step 4: Simplify right side
    836.79x = 499,997.27
  5. Step 5: Solve for x
    x = 499,997.27/836.79
  6. Step 6: Final answer
    x = 597.52

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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.