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Finding the Third Proportional to 129,177.75 and 189,939

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Solution

The third proportional to 129,177.75 and 189,939 is: 279,280.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,177.75 : 189,939 = 189,939 : x
  2. Step 2: Convert to fraction form
    129,177.75/189,939 = 189,939/x
  3. Step 3: Cross multiply
    129,177.75x = 189,939 × 189,939
  4. Step 4: Simplify right side
    129,177.75x = 36,076,823,721
  5. Step 5: Solve for x
    x = 36,076,823,721/129,177.75
  6. Step 6: Final answer
    x = 279,280.48

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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.