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Finding the Fourth Proportional to 631.75, 871.82 and 355.75

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Solution

The fourth proportional to 631.75, 871.82 and 355.75 is: 490.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.75 : 871.82 = 355.75 : x
  2. Step 2: Convert to fraction form
    631.75/871.82 = 355.75/x
  3. Step 3: Cross multiply
    631.75x = 871.82 × 355.75
  4. Step 4: Simplify right side
    631.75x = 310,149.97
  5. Step 5: Solve for x
    x = 310,149.97/631.75
  6. Step 6: Final answer
    x = 490.94

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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.