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Finding the Third Proportional to 20,855 and 30,729.50

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Solution

The third proportional to 20,855 and 30,729.50 is: 45,279.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855 : 30,729.50 = 30,729.50 : x
  2. Step 2: Convert to fraction form
    20,855/30,729.50 = 30,729.50/x
  3. Step 3: Cross multiply
    20,855x = 30,729.50 × 30,729.50
  4. Step 4: Simplify right side
    20,855x = 944,302,170.25
  5. Step 5: Solve for x
    x = 944,302,170.25/20,855
  6. Step 6: Final answer
    x = 45,279.41

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.