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Finding the Third Proportional to 21,169 and 31,120

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Solution

The third proportional to 21,169 and 31,120 is: 45,748.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,169 : 31,120 = 31,120 : x
  2. Step 2: Convert to fraction form
    21,169/31,120 = 31,120/x
  3. Step 3: Cross multiply
    21,169x = 31,120 × 31,120
  4. Step 4: Simplify right side
    21,169x = 968,454,400
  5. Step 5: Solve for x
    x = 968,454,400/21,169
  6. Step 6: Final answer
    x = 45,748.71

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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.