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Finding the Fourth Proportional to 631.75, 947.44 and 220.81

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Solution

The fourth proportional to 631.75, 947.44 and 220.81 is: 331.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.75 : 947.44 = 220.81 : x
  2. Step 2: Convert to fraction form
    631.75/947.44 = 220.81/x
  3. Step 3: Cross multiply
    631.75x = 947.44 × 220.81
  4. Step 4: Simplify right side
    631.75x = 209,204.23
  5. Step 5: Solve for x
    x = 209,204.23/631.75
  6. Step 6: Final answer
    x = 331.15

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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.