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Finding the Fourth Proportional to 826.58, 1,239.68 and 278.76

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Solution

The fourth proportional to 826.58, 1,239.68 and 278.76 is: 418.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.58 : 1,239.68 = 278.76 : x
  2. Step 2: Convert to fraction form
    826.58/1,239.68 = 278.76/x
  3. Step 3: Cross multiply
    826.58x = 1,239.68 × 278.76
  4. Step 4: Simplify right side
    826.58x = 345,573.20
  5. Step 5: Solve for x
    x = 345,573.20/826.58
  6. Step 6: Final answer
    x = 418.08

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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.