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Finding the Third Proportional to 21,399 and 47,715.75

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Solution

The third proportional to 21,399 and 47,715.75 is: 106,397.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,399 : 47,715.75 = 47,715.75 : x
  2. Step 2: Convert to fraction form
    21,399/47,715.75 = 47,715.75/x
  3. Step 3: Cross multiply
    21,399x = 47,715.75 × 47,715.75
  4. Step 4: Simplify right side
    21,399x = 2,276,792,798.06
  5. Step 5: Solve for x
    x = 2,276,792,798.06/21,399
  6. Step 6: Final answer
    x = 106,397.16

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Why These Related Problems?

These problems maintain the same ratio (2.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.