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Finding the Fourth Proportional to 826.96, 1,139.40 and 550.48

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Solution

The fourth proportional to 826.96, 1,139.40 and 550.48 is: 758.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.96 : 1,139.40 = 550.48 : x
  2. Step 2: Convert to fraction form
    826.96/1,139.40 = 550.48/x
  3. Step 3: Cross multiply
    826.96x = 1,139.40 × 550.48
  4. Step 4: Simplify right side
    826.96x = 627,216.91
  5. Step 5: Solve for x
    x = 627,216.91/826.96
  6. Step 6: Final answer
    x = 758.46

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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.