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Finding the Third Proportional to 421.03 and 828.14

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Solution

The third proportional to 421.03 and 828.14 is: 1,628.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.03 : 828.14 = 828.14 : x
  2. Step 2: Convert to fraction form
    421.03/828.14 = 828.14/x
  3. Step 3: Cross multiply
    421.03x = 828.14 × 828.14
  4. Step 4: Simplify right side
    421.03x = 685,816.89
  5. Step 5: Solve for x
    x = 685,816.89/421.03
  6. Step 6: Final answer
    x = 1,628.90

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.