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Finding the Fourth Proportional to 826.78, 1,240.56 and 415.96

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Solution

The fourth proportional to 826.78, 1,240.56 and 415.96 is: 624.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.78 : 1,240.56 = 415.96 : x
  2. Step 2: Convert to fraction form
    826.78/1,240.56 = 415.96/x
  3. Step 3: Cross multiply
    826.78x = 1,240.56 × 415.96
  4. Step 4: Simplify right side
    826.78x = 516,023.34
  5. Step 5: Solve for x
    x = 516,023.34/826.78
  6. Step 6: Final answer
    x = 624.14

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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.