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Finding the Third Proportional to 20,400 and 30,220

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Solution

The third proportional to 20,400 and 30,220 is: 44,767.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,400 : 30,220 = 30,220 : x
  2. Step 2: Convert to fraction form
    20,400/30,220 = 30,220/x
  3. Step 3: Cross multiply
    20,400x = 30,220 × 30,220
  4. Step 4: Simplify right side
    20,400x = 913,248,400
  5. Step 5: Solve for x
    x = 913,248,400/20,400
  6. Step 6: Final answer
    x = 44,767.08

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.