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Finding the Third Proportional to 221.70 and 476.72

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Solution

The third proportional to 221.70 and 476.72 is: 1,025.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.70 : 476.72 = 476.72 : x
  2. Step 2: Convert to fraction form
    221.70/476.72 = 476.72/x
  3. Step 3: Cross multiply
    221.70x = 476.72 × 476.72
  4. Step 4: Simplify right side
    221.70x = 227,260.77
  5. Step 5: Solve for x
    x = 227,260.77/221.70
  6. Step 6: Final answer
    x = 1,025.10

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.