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Finding the Fourth Proportional to 836.79, 1,255.34 and 281.59

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Solution

The fourth proportional to 836.79, 1,255.34 and 281.59 is: 422.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.79 : 1,255.34 = 281.59 : x
  2. Step 2: Convert to fraction form
    836.79/1,255.34 = 281.59/x
  3. Step 3: Cross multiply
    836.79x = 1,255.34 × 281.59
  4. Step 4: Simplify right side
    836.79x = 353,484.91
  5. Step 5: Solve for x
    x = 353,484.91/836.79
  6. Step 6: Final answer
    x = 422.43

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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.