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Finding the Third Proportional to 21,420 and 47,428

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Solution

The third proportional to 21,420 and 47,428 is: 105,014.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420 : 47,428 = 47,428 : x
  2. Step 2: Convert to fraction form
    21,420/47,428 = 47,428/x
  3. Step 3: Cross multiply
    21,420x = 47,428 × 47,428
  4. Step 4: Simplify right side
    21,420x = 2,249,415,184
  5. Step 5: Solve for x
    x = 2,249,415,184/21,420
  6. Step 6: Final answer
    x = 105,014.71

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.