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Finding the Third Proportional to 261,279 and 390,902

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Solution

The third proportional to 261,279 and 390,902 is: 584,832.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,279 : 390,902 = 390,902 : x
  2. Step 2: Convert to fraction form
    261,279/390,902 = 390,902/x
  3. Step 3: Cross multiply
    261,279x = 390,902 × 390,902
  4. Step 4: Simplify right side
    261,279x = 152,804,373,604
  5. Step 5: Solve for x
    x = 152,804,373,604/261,279
  6. Step 6: Final answer
    x = 584,832.20

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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.