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Finding the Third Proportional to 129,658 and 211,715

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Solution

The third proportional to 129,658 and 211,715 is: 345,703.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,658 : 211,715 = 211,715 : x
  2. Step 2: Convert to fraction form
    129,658/211,715 = 211,715/x
  3. Step 3: Cross multiply
    129,658x = 211,715 × 211,715
  4. Step 4: Simplify right side
    129,658x = 44,823,241,225
  5. Step 5: Solve for x
    x = 44,823,241,225/129,658
  6. Step 6: Final answer
    x = 345,703.63

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.