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Finding the Fourth Proportional to 631.39, 871.29 and 351.62

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Solution

The fourth proportional to 631.39, 871.29 and 351.62 is: 485.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.39 : 871.29 = 351.62 : x
  2. Step 2: Convert to fraction form
    631.39/871.29 = 351.62/x
  3. Step 3: Cross multiply
    631.39x = 871.29 × 351.62
  4. Step 4: Simplify right side
    631.39x = 306,358.63
  5. Step 5: Solve for x
    x = 306,358.63/631.39
  6. Step 6: Final answer
    x = 485.21

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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.