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Finding the Third Proportional to 21,118 and 28,430

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Solution

The third proportional to 21,118 and 28,430 is: 38,273.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118 : 28,430 = 28,430 : x
  2. Step 2: Convert to fraction form
    21,118/28,430 = 28,430/x
  3. Step 3: Cross multiply
    21,118x = 28,430 × 28,430
  4. Step 4: Simplify right side
    21,118x = 808,264,900
  5. Step 5: Solve for x
    x = 808,264,900/21,118
  6. Step 6: Final answer
    x = 38,273.74

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.