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Finding the Third Proportional to 261,780 and 415,188

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Solution

The third proportional to 261,780 and 415,188 is: 658,495.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,780 : 415,188 = 415,188 : x
  2. Step 2: Convert to fraction form
    261,780/415,188 = 415,188/x
  3. Step 3: Cross multiply
    261,780x = 415,188 × 415,188
  4. Step 4: Simplify right side
    261,780x = 172,381,075,344
  5. Step 5: Solve for x
    x = 172,381,075,344/261,780
  6. Step 6: Final answer
    x = 658,495.97

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.