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Finding the Third Proportional to 31,756.50 and 68,985

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Solution

The third proportional to 31,756.50 and 68,985 is: 149,856.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,756.50 : 68,985 = 68,985 : x
  2. Step 2: Convert to fraction form
    31,756.50/68,985 = 68,985/x
  3. Step 3: Cross multiply
    31,756.50x = 68,985 × 68,985
  4. Step 4: Simplify right side
    31,756.50x = 4,758,930,225
  5. Step 5: Solve for x
    x = 4,758,930,225/31,756.50
  6. Step 6: Final answer
    x = 149,856.89

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.