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Finding the Third Proportional to 39,431.50 and 56,680

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Solution

The third proportional to 39,431.50 and 56,680 is: 81,473.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,431.50 : 56,680 = 56,680 : x
  2. Step 2: Convert to fraction form
    39,431.50/56,680 = 56,680/x
  3. Step 3: Cross multiply
    39,431.50x = 56,680 × 56,680
  4. Step 4: Simplify right side
    39,431.50x = 3,212,622,400
  5. Step 5: Solve for x
    x = 3,212,622,400/39,431.50
  6. Step 6: Final answer
    x = 81,473.50

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.