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Finding the Third Proportional to 261,267 and 390,885

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Solution

The third proportional to 261,267 and 390,885 is: 584,808.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,267 : 390,885 = 390,885 : x
  2. Step 2: Convert to fraction form
    261,267/390,885 = 390,885/x
  3. Step 3: Cross multiply
    261,267x = 390,885 × 390,885
  4. Step 4: Simplify right side
    261,267x = 152,791,083,225
  5. Step 5: Solve for x
    x = 152,791,083,225/261,267
  6. Step 6: Final answer
    x = 584,808.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.