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Finding the Third Proportional to 36,990 and 78,908

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Solution

The third proportional to 36,990 and 78,908 is: 168,328.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    36,990 : 78,908 = 78,908 : x
  2. Step 2: Convert to fraction form
    36,990/78,908 = 78,908/x
  3. Step 3: Cross multiply
    36,990x = 78,908 × 78,908
  4. Step 4: Simplify right side
    36,990x = 6,226,472,464
  5. Step 5: Solve for x
    x = 6,226,472,464/36,990
  6. Step 6: Final answer
    x = 168,328.53

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.