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Finding the Third Proportional to 421.45 and 922.64

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Solution

The third proportional to 421.45 and 922.64 is: 2,019.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.45 : 922.64 = 922.64 : x
  2. Step 2: Convert to fraction form
    421.45/922.64 = 922.64/x
  3. Step 3: Cross multiply
    421.45x = 922.64 × 922.64
  4. Step 4: Simplify right side
    421.45x = 851,265.72
  5. Step 5: Solve for x
    x = 851,265.72/421.45
  6. Step 6: Final answer
    x = 2,019.83

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.