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Finding the Third Proportional to 15,833 and 21,315

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Solution

The third proportional to 15,833 and 21,315 is: 28,695.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,833 : 21,315 = 21,315 : x
  2. Step 2: Convert to fraction form
    15,833/21,315 = 21,315/x
  3. Step 3: Cross multiply
    15,833x = 21,315 × 21,315
  4. Step 4: Simplify right side
    15,833x = 454,329,225
  5. Step 5: Solve for x
    x = 454,329,225/15,833
  6. Step 6: Final answer
    x = 28,695.08

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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.