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Finding the Fourth Proportional to 825.80, 1,139.97 and 648.34

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Solution

The fourth proportional to 825.80, 1,139.97 and 648.34 is: 895.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.80 : 1,139.97 = 648.34 : x
  2. Step 2: Convert to fraction form
    825.80/1,139.97 = 648.34/x
  3. Step 3: Cross multiply
    825.80x = 1,139.97 × 648.34
  4. Step 4: Simplify right side
    825.80x = 739,087.73
  5. Step 5: Solve for x
    x = 739,087.73/825.80
  6. Step 6: Final answer
    x = 895.00

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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.