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Finding the Fourth Proportional to 825.35, 1,139.12 and 616.57

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Solution

The fourth proportional to 825.35, 1,139.12 and 616.57 is: 850.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.35 : 1,139.12 = 616.57 : x
  2. Step 2: Convert to fraction form
    825.35/1,139.12 = 616.57/x
  3. Step 3: Cross multiply
    825.35x = 1,139.12 × 616.57
  4. Step 4: Simplify right side
    825.35x = 702,345.91
  5. Step 5: Solve for x
    x = 702,345.91/825.35
  6. Step 6: Final answer
    x = 850.97

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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.