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Finding the Fourth Proportional to 826.06, 1,139.97 and 515.50

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Solution

The fourth proportional to 826.06, 1,139.97 and 515.50 is: 711.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.06 : 1,139.97 = 515.50 : x
  2. Step 2: Convert to fraction form
    826.06/1,139.97 = 515.50/x
  3. Step 3: Cross multiply
    826.06x = 1,139.97 × 515.50
  4. Step 4: Simplify right side
    826.06x = 587,654.54
  5. Step 5: Solve for x
    x = 587,654.54/826.06
  6. Step 6: Final answer
    x = 711.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.