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Finding the Third Proportional to 21,685 and 47,339

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Solution

The third proportional to 21,685 and 47,339 is: 103,342.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,685 : 47,339 = 47,339 : x
  2. Step 2: Convert to fraction form
    21,685/47,339 = 47,339/x
  3. Step 3: Cross multiply
    21,685x = 47,339 × 47,339
  4. Step 4: Simplify right side
    21,685x = 2,240,980,921
  5. Step 5: Solve for x
    x = 2,240,980,921/21,685
  6. Step 6: Final answer
    x = 103,342.45

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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.