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Finding the Third Proportional to 21,870 and 47,709

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Solution

The third proportional to 21,870 and 47,709 is: 104,076.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,870 : 47,709 = 47,709 : x
  2. Step 2: Convert to fraction form
    21,870/47,709 = 47,709/x
  3. Step 3: Cross multiply
    21,870x = 47,709 × 47,709
  4. Step 4: Simplify right side
    21,870x = 2,276,148,681
  5. Step 5: Solve for x
    x = 2,276,148,681/21,870
  6. Step 6: Final answer
    x = 104,076.30

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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.