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Finding the Third Proportional to 258,656 and 390,288

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Solution

The third proportional to 258,656 and 390,288 is: 588,908.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,656 : 390,288 = 390,288 : x
  2. Step 2: Convert to fraction form
    258,656/390,288 = 390,288/x
  3. Step 3: Cross multiply
    258,656x = 390,288 × 390,288
  4. Step 4: Simplify right side
    258,656x = 152,324,722,944
  5. Step 5: Solve for x
    x = 152,324,722,944/258,656
  6. Step 6: Final answer
    x = 588,908.52

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.