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Finding the Third Proportional to 7,687.50 and 11,971.50

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Solution

The third proportional to 7,687.50 and 11,971.50 is: 18,642.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,687.50 : 11,971.50 = 11,971.50 : x
  2. Step 2: Convert to fraction form
    7,687.50/11,971.50 = 11,971.50/x
  3. Step 3: Cross multiply
    7,687.50x = 11,971.50 × 11,971.50
  4. Step 4: Simplify right side
    7,687.50x = 143,316,812.25
  5. Step 5: Solve for x
    x = 143,316,812.25/7,687.50
  6. Step 6: Final answer
    x = 18,642.84

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.