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Finding the Fourth Proportional to 825.73, 1,240.42 and 643.48

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Solution

The fourth proportional to 825.73, 1,240.42 and 643.48 is: 966.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.73 : 1,240.42 = 643.48 : x
  2. Step 2: Convert to fraction form
    825.73/1,240.42 = 643.48/x
  3. Step 3: Cross multiply
    825.73x = 1,240.42 × 643.48
  4. Step 4: Simplify right side
    825.73x = 798,185.46
  5. Step 5: Solve for x
    x = 798,185.46/825.73
  6. Step 6: Final answer
    x = 966.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.