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Finding the Third Proportional to 85,680 and 128,015

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Solution

The third proportional to 85,680 and 128,015 is: 191,267.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,680 : 128,015 = 128,015 : x
  2. Step 2: Convert to fraction form
    85,680/128,015 = 128,015/x
  3. Step 3: Cross multiply
    85,680x = 128,015 × 128,015
  4. Step 4: Simplify right side
    85,680x = 16,387,840,225
  5. Step 5: Solve for x
    x = 16,387,840,225/85,680
  6. Step 6: Final answer
    x = 191,267.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.