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Finding the Fourth Proportional to 826.20, 1,239.50 and 278.64

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Solution

The fourth proportional to 826.20, 1,239.50 and 278.64 is: 418.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.20 : 1,239.50 = 278.64 : x
  2. Step 2: Convert to fraction form
    826.20/1,239.50 = 278.64/x
  3. Step 3: Cross multiply
    826.20x = 1,239.50 × 278.64
  4. Step 4: Simplify right side
    826.20x = 345,374.98
  5. Step 5: Solve for x
    x = 345,374.98/826.20
  6. Step 6: Final answer
    x = 418.03

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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.