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Finding the Fourth Proportional to 1,704.78, 2,556.60 and 826.80

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Solution

The fourth proportional to 1,704.78, 2,556.60 and 826.80 is: 1,239.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,704.78 : 2,556.60 = 826.80 : x
  2. Step 2: Convert to fraction form
    1,704.78/2,556.60 = 826.80/x
  3. Step 3: Cross multiply
    1,704.78x = 2,556.60 × 826.80
  4. Step 4: Simplify right side
    1,704.78x = 2,113,796.88
  5. Step 5: Solve for x
    x = 2,113,796.88/1,704.78
  6. Step 6: Final answer
    x = 1,239.92

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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.