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Finding the Fourth Proportional to 631.88, 948.01 and 221.05

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Solution

The fourth proportional to 631.88, 948.01 and 221.05 is: 331.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.88 : 948.01 = 221.05 : x
  2. Step 2: Convert to fraction form
    631.88/948.01 = 221.05/x
  3. Step 3: Cross multiply
    631.88x = 948.01 × 221.05
  4. Step 4: Simplify right side
    631.88x = 209,557.68
  5. Step 5: Solve for x
    x = 209,557.68/631.88
  6. Step 6: Final answer
    x = 331.64

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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.