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Finding the Third Proportional to 666.50 and 889.75

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Solution

The third proportional to 666.50 and 889.75 is: 1,187.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.50 : 889.75 = 889.75 : x
  2. Step 2: Convert to fraction form
    666.50/889.75 = 889.75/x
  3. Step 3: Cross multiply
    666.50x = 889.75 × 889.75
  4. Step 4: Simplify right side
    666.50x = 791,655.06
  5. Step 5: Solve for x
    x = 791,655.06/666.50
  6. Step 6: Final answer
    x = 1,187.78

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.