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Finding the Third Proportional to 87,510 and 129,420

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Solution

The third proportional to 87,510 and 129,420 is: 191,401.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,510 : 129,420 = 129,420 : x
  2. Step 2: Convert to fraction form
    87,510/129,420 = 129,420/x
  3. Step 3: Cross multiply
    87,510x = 129,420 × 129,420
  4. Step 4: Simplify right side
    87,510x = 16,749,536,400
  5. Step 5: Solve for x
    x = 16,749,536,400/87,510
  6. Step 6: Final answer
    x = 191,401.40

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.