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Finding the Fourth Proportional to 631.58, 871.51 and 351.79

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Solution

The fourth proportional to 631.58, 871.51 and 351.79 is: 485.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.58 : 871.51 = 351.79 : x
  2. Step 2: Convert to fraction form
    631.58/871.51 = 351.79/x
  3. Step 3: Cross multiply
    631.58x = 871.51 × 351.79
  4. Step 4: Simplify right side
    631.58x = 306,589.37
  5. Step 5: Solve for x
    x = 306,589.37/631.58
  6. Step 6: Final answer
    x = 485.43

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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.