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Finding the Fourth Proportional to 631.60, 947.44 and 220.72

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Solution

The fourth proportional to 631.60, 947.44 and 220.72 is: 331.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.60 : 947.44 = 220.72 : x
  2. Step 2: Convert to fraction form
    631.60/947.44 = 220.72/x
  3. Step 3: Cross multiply
    631.60x = 947.44 × 220.72
  4. Step 4: Simplify right side
    631.60x = 209,118.96
  5. Step 5: Solve for x
    x = 209,118.96/631.60
  6. Step 6: Final answer
    x = 331.09

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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.