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Finding the Third Proportional to 15,724 and 21,639

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Solution

The third proportional to 15,724 and 21,639 is: 29,779.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,724 : 21,639 = 21,639 : x
  2. Step 2: Convert to fraction form
    15,724/21,639 = 21,639/x
  3. Step 3: Cross multiply
    15,724x = 21,639 × 21,639
  4. Step 4: Simplify right side
    15,724x = 468,246,321
  5. Step 5: Solve for x
    x = 468,246,321/15,724
  6. Step 6: Final answer
    x = 29,779.08

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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.