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Finding the Third Proportional to 31,478 and 48,311

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Solution

The third proportional to 31,478 and 48,311 is: 74,145.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,478 : 48,311 = 48,311 : x
  2. Step 2: Convert to fraction form
    31,478/48,311 = 48,311/x
  3. Step 3: Cross multiply
    31,478x = 48,311 × 48,311
  4. Step 4: Simplify right side
    31,478x = 2,333,952,721
  5. Step 5: Solve for x
    x = 2,333,952,721/31,478
  6. Step 6: Final answer
    x = 74,145.52

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.