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Finding the Third Proportional to 20,700 and 38,460

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Solution

The third proportional to 20,700 and 38,460 is: 71,457.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,700 : 38,460 = 38,460 : x
  2. Step 2: Convert to fraction form
    20,700/38,460 = 38,460/x
  3. Step 3: Cross multiply
    20,700x = 38,460 × 38,460
  4. Step 4: Simplify right side
    20,700x = 1,479,171,600
  5. Step 5: Solve for x
    x = 1,479,171,600/20,700
  6. Step 6: Final answer
    x = 71,457.57

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.