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Finding the Third Proportional to 31,911 and 66,448

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Solution

The third proportional to 31,911 and 66,448 is: 138,364.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,911 : 66,448 = 66,448 : x
  2. Step 2: Convert to fraction form
    31,911/66,448 = 66,448/x
  3. Step 3: Cross multiply
    31,911x = 66,448 × 66,448
  4. Step 4: Simplify right side
    31,911x = 4,415,336,704
  5. Step 5: Solve for x
    x = 4,415,336,704/31,911
  6. Step 6: Final answer
    x = 138,364.10

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.