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Finding the Third Proportional to 21,160 and 40,400

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Solution

The third proportional to 21,160 and 40,400 is: 77,134.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,160 : 40,400 = 40,400 : x
  2. Step 2: Convert to fraction form
    21,160/40,400 = 40,400/x
  3. Step 3: Cross multiply
    21,160x = 40,400 × 40,400
  4. Step 4: Simplify right side
    21,160x = 1,632,160,000
  5. Step 5: Solve for x
    x = 1,632,160,000/21,160
  6. Step 6: Final answer
    x = 77,134.22

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Why These Related Problems?

These problems maintain the same ratio (1.91) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.