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Finding the Third Proportional to 51,990 and 78,453

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Solution

The third proportional to 51,990 and 78,453 is: 118,385.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,990 : 78,453 = 78,453 : x
  2. Step 2: Convert to fraction form
    51,990/78,453 = 78,453/x
  3. Step 3: Cross multiply
    51,990x = 78,453 × 78,453
  4. Step 4: Simplify right side
    51,990x = 6,154,873,209
  5. Step 5: Solve for x
    x = 6,154,873,209/51,990
  6. Step 6: Final answer
    x = 118,385.71

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.