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Finding the Third Proportional to 18,421 and 28,331

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Solution

The third proportional to 18,421 and 28,331 is: 43,572.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421 : 28,331 = 28,331 : x
  2. Step 2: Convert to fraction form
    18,421/28,331 = 28,331/x
  3. Step 3: Cross multiply
    18,421x = 28,331 × 28,331
  4. Step 4: Simplify right side
    18,421x = 802,645,561
  5. Step 5: Solve for x
    x = 802,645,561/18,421
  6. Step 6: Final answer
    x = 43,572.31

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.