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Finding the Fourth Proportional to 631.97, 948.09 and 221.09

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Solution

The fourth proportional to 631.97, 948.09 and 221.09 is: 331.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.97 : 948.09 = 221.09 : x
  2. Step 2: Convert to fraction form
    631.97/948.09 = 221.09/x
  3. Step 3: Cross multiply
    631.97x = 948.09 × 221.09
  4. Step 4: Simplify right side
    631.97x = 209,613.22
  5. Step 5: Solve for x
    x = 209,613.22/631.97
  6. Step 6: Final answer
    x = 331.68

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Double scale
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Similar ratio
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1.5x scale

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.