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Finding the Fourth Proportional to 826.20, 1,239.84 and 664.74

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Solution

The fourth proportional to 826.20, 1,239.84 and 664.74 is: 997.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.20 : 1,239.84 = 664.74 : x
  2. Step 2: Convert to fraction form
    826.20/1,239.84 = 664.74/x
  3. Step 3: Cross multiply
    826.20x = 1,239.84 × 664.74
  4. Step 4: Simplify right side
    826.20x = 824,171.24
  5. Step 5: Solve for x
    x = 824,171.24/826.20
  6. Step 6: Final answer
    x = 997.54

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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.