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Finding the Third Proportional to 15,719 and 20,985

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Solution

The third proportional to 15,719 and 20,985 is: 28,015.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,719 : 20,985 = 20,985 : x
  2. Step 2: Convert to fraction form
    15,719/20,985 = 20,985/x
  3. Step 3: Cross multiply
    15,719x = 20,985 × 20,985
  4. Step 4: Simplify right side
    15,719x = 440,370,225
  5. Step 5: Solve for x
    x = 440,370,225/15,719
  6. Step 6: Final answer
    x = 28,015.16

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.