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Finding the Fourth Proportional to 640.31, 883.26 and 443.48

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Solution

The fourth proportional to 640.31, 883.26 and 443.48 is: 611.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.31 : 883.26 = 443.48 : x
  2. Step 2: Convert to fraction form
    640.31/883.26 = 443.48/x
  3. Step 3: Cross multiply
    640.31x = 883.26 × 443.48
  4. Step 4: Simplify right side
    640.31x = 391,703.73
  5. Step 5: Solve for x
    x = 391,703.73/640.31
  6. Step 6: Final answer
    x = 611.75

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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.