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Finding the Third Proportional to 15,648 and 21,520

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Solution

The third proportional to 15,648 and 21,520 is: 29,595.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,648 : 21,520 = 21,520 : x
  2. Step 2: Convert to fraction form
    15,648/21,520 = 21,520/x
  3. Step 3: Cross multiply
    15,648x = 21,520 × 21,520
  4. Step 4: Simplify right side
    15,648x = 463,110,400
  5. Step 5: Solve for x
    x = 463,110,400/15,648
  6. Step 6: Final answer
    x = 29,595.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.