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Finding the Fourth Proportional to 836.78, 1,254.81 and 316.69

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Solution

The fourth proportional to 836.78, 1,254.81 and 316.69 is: 474.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.78 : 1,254.81 = 316.69 : x
  2. Step 2: Convert to fraction form
    836.78/1,254.81 = 316.69/x
  3. Step 3: Cross multiply
    836.78x = 1,254.81 × 316.69
  4. Step 4: Simplify right side
    836.78x = 397,385.78
  5. Step 5: Solve for x
    x = 397,385.78/836.78
  6. Step 6: Final answer
    x = 474.90

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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.