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Finding the Third Proportional to 87,390 and 189,612

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Solution

The third proportional to 87,390 and 189,612 is: 411,405.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,390 : 189,612 = 189,612 : x
  2. Step 2: Convert to fraction form
    87,390/189,612 = 189,612/x
  3. Step 3: Cross multiply
    87,390x = 189,612 × 189,612
  4. Step 4: Simplify right side
    87,390x = 35,952,710,544
  5. Step 5: Solve for x
    x = 35,952,710,544/87,390
  6. Step 6: Final answer
    x = 411,405.32

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.