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Finding the Fourth Proportional to 836.20, 1,253.36 and 424.76

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Solution

The fourth proportional to 836.20, 1,253.36 and 424.76 is: 636.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.20 : 1,253.36 = 424.76 : x
  2. Step 2: Convert to fraction form
    836.20/1,253.36 = 424.76/x
  3. Step 3: Cross multiply
    836.20x = 1,253.36 × 424.76
  4. Step 4: Simplify right side
    836.20x = 532,377.19
  5. Step 5: Solve for x
    x = 532,377.19/836.20
  6. Step 6: Final answer
    x = 636.66

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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.