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Finding the Third Proportional to 43,890 and 66,915

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Solution

The third proportional to 43,890 and 66,915 is: 102,019.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,890 : 66,915 = 66,915 : x
  2. Step 2: Convert to fraction form
    43,890/66,915 = 66,915/x
  3. Step 3: Cross multiply
    43,890x = 66,915 × 66,915
  4. Step 4: Simplify right side
    43,890x = 4,477,617,225
  5. Step 5: Solve for x
    x = 4,477,617,225/43,890
  6. Step 6: Final answer
    x = 102,019.08

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.