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Finding the Third Proportional to 21,438 and 28,323

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Solution

The third proportional to 21,438 and 28,323 is: 37,419.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,438 : 28,323 = 28,323 : x
  2. Step 2: Convert to fraction form
    21,438/28,323 = 28,323/x
  3. Step 3: Cross multiply
    21,438x = 28,323 × 28,323
  4. Step 4: Simplify right side
    21,438x = 802,192,329
  5. Step 5: Solve for x
    x = 802,192,329/21,438
  6. Step 6: Final answer
    x = 37,419.18

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.