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Finding the Third Proportional to 21,879 and 47,646

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Solution

The third proportional to 21,879 and 47,646 is: 103,758.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879 : 47,646 = 47,646 : x
  2. Step 2: Convert to fraction form
    21,879/47,646 = 47,646/x
  3. Step 3: Cross multiply
    21,879x = 47,646 × 47,646
  4. Step 4: Simplify right side
    21,879x = 2,270,141,316
  5. Step 5: Solve for x
    x = 2,270,141,316/21,879
  6. Step 6: Final answer
    x = 103,758.92

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.