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Finding the Third Proportional to 61,380 and 90,126

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Solution

The third proportional to 61,380 and 90,126 is: 132,334.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,380 : 90,126 = 90,126 : x
  2. Step 2: Convert to fraction form
    61,380/90,126 = 90,126/x
  3. Step 3: Cross multiply
    61,380x = 90,126 × 90,126
  4. Step 4: Simplify right side
    61,380x = 8,122,695,876
  5. Step 5: Solve for x
    x = 8,122,695,876/61,380
  6. Step 6: Final answer
    x = 132,334.57

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.