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Finding the Third Proportional to 21,820 and 47,128

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Solution

The third proportional to 21,820 and 47,128 is: 101,789.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,820 : 47,128 = 47,128 : x
  2. Step 2: Convert to fraction form
    21,820/47,128 = 47,128/x
  3. Step 3: Cross multiply
    21,820x = 47,128 × 47,128
  4. Step 4: Simplify right side
    21,820x = 2,221,048,384
  5. Step 5: Solve for x
    x = 2,221,048,384/21,820
  6. Step 6: Final answer
    x = 101,789.57

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.