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Finding the Third Proportional to 128,127 and 200,415

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Solution

The third proportional to 128,127 and 200,415 is: 313,487.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,127 : 200,415 = 200,415 : x
  2. Step 2: Convert to fraction form
    128,127/200,415 = 200,415/x
  3. Step 3: Cross multiply
    128,127x = 200,415 × 200,415
  4. Step 4: Simplify right side
    128,127x = 40,166,172,225
  5. Step 5: Solve for x
    x = 40,166,172,225/128,127
  6. Step 6: Final answer
    x = 313,487.18

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.