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Finding the Fourth Proportional to 631.95, 947.80 and 221.11

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Solution

The fourth proportional to 631.95, 947.80 and 221.11 is: 331.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.95 : 947.80 = 221.11 : x
  2. Step 2: Convert to fraction form
    631.95/947.80 = 221.11/x
  3. Step 3: Cross multiply
    631.95x = 947.80 × 221.11
  4. Step 4: Simplify right side
    631.95x = 209,568.06
  5. Step 5: Solve for x
    x = 209,568.06/631.95
  6. Step 6: Final answer
    x = 331.62

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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.