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Finding the Fourth Proportional to 631.87, 947.96 and 221.01

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Solution

The fourth proportional to 631.87, 947.96 and 221.01 is: 331.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.87 : 947.96 = 221.01 : x
  2. Step 2: Convert to fraction form
    631.87/947.96 = 221.01/x
  3. Step 3: Cross multiply
    631.87x = 947.96 × 221.01
  4. Step 4: Simplify right side
    631.87x = 209,508.64
  5. Step 5: Solve for x
    x = 209,508.64/631.87
  6. Step 6: Final answer
    x = 331.57

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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.