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Finding the Third Proportional to 85,779 and 128,259

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Solution

The third proportional to 85,779 and 128,259 is: 191,776.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,779 : 128,259 = 128,259 : x
  2. Step 2: Convert to fraction form
    85,779/128,259 = 128,259/x
  3. Step 3: Cross multiply
    85,779x = 128,259 × 128,259
  4. Step 4: Simplify right side
    85,779x = 16,450,371,081
  5. Step 5: Solve for x
    x = 16,450,371,081/85,779
  6. Step 6: Final answer
    x = 191,776.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.