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Finding the Fourth Proportional to 825.29, 1,139.37 and 545.99

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Solution

The fourth proportional to 825.29, 1,139.37 and 545.99 is: 753.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.29 : 1,139.37 = 545.99 : x
  2. Step 2: Convert to fraction form
    825.29/1,139.37 = 545.99/x
  3. Step 3: Cross multiply
    825.29x = 1,139.37 × 545.99
  4. Step 4: Simplify right side
    825.29x = 622,083.29
  5. Step 5: Solve for x
    x = 622,083.29/825.29
  6. Step 6: Final answer
    x = 753.78

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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.