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Finding the Third Proportional to 15,317 and 20,787

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Solution

The third proportional to 15,317 and 20,787 is: 28,210.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,317 : 20,787 = 20,787 : x
  2. Step 2: Convert to fraction form
    15,317/20,787 = 20,787/x
  3. Step 3: Cross multiply
    15,317x = 20,787 × 20,787
  4. Step 4: Simplify right side
    15,317x = 432,099,369
  5. Step 5: Solve for x
    x = 432,099,369/15,317
  6. Step 6: Final answer
    x = 28,210.44

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.