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Finding the Third Proportional to 85,407 and 128,385

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Solution

The third proportional to 85,407 and 128,385 is: 192,990.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,407 : 128,385 = 128,385 : x
  2. Step 2: Convert to fraction form
    85,407/128,385 = 128,385/x
  3. Step 3: Cross multiply
    85,407x = 128,385 × 128,385
  4. Step 4: Simplify right side
    85,407x = 16,482,708,225
  5. Step 5: Solve for x
    x = 16,482,708,225/85,407
  6. Step 6: Final answer
    x = 192,990.13

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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.