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Finding the Third Proportional to 66,885.75 and 81,243

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Solution

The third proportional to 66,885.75 and 81,243 is: 98,682.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,885.75 : 81,243 = 81,243 : x
  2. Step 2: Convert to fraction form
    66,885.75/81,243 = 81,243/x
  3. Step 3: Cross multiply
    66,885.75x = 81,243 × 81,243
  4. Step 4: Simplify right side
    66,885.75x = 6,600,425,049
  5. Step 5: Solve for x
    x = 6,600,425,049/66,885.75
  6. Step 6: Final answer
    x = 98,682.08

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.