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Finding the Fourth Proportional to 836.83, 1,255.15 and 316.61

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Solution

The fourth proportional to 836.83, 1,255.15 and 316.61 is: 474.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.83 : 1,255.15 = 316.61 : x
  2. Step 2: Convert to fraction form
    836.83/1,255.15 = 316.61/x
  3. Step 3: Cross multiply
    836.83x = 1,255.15 × 316.61
  4. Step 4: Simplify right side
    836.83x = 397,390.09
  5. Step 5: Solve for x
    x = 397,390.09/836.83
  6. Step 6: Final answer
    x = 474.87

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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.