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Finding the Fourth Proportional to 631.97, 947.96 and 221.12

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Solution

The fourth proportional to 631.97, 947.96 and 221.12 is: 331.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.97 : 947.96 = 221.12 : x
  2. Step 2: Convert to fraction form
    631.97/947.96 = 221.12/x
  3. Step 3: Cross multiply
    631.97x = 947.96 × 221.12
  4. Step 4: Simplify right side
    631.97x = 209,612.92
  5. Step 5: Solve for x
    x = 209,612.92/631.97
  6. Step 6: Final answer
    x = 331.68

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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.