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Finding the Third Proportional to 279,990 and 378,513

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Solution

The third proportional to 279,990 and 378,513 is: 511,704.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,990 : 378,513 = 378,513 : x
  2. Step 2: Convert to fraction form
    279,990/378,513 = 378,513/x
  3. Step 3: Cross multiply
    279,990x = 378,513 × 378,513
  4. Step 4: Simplify right side
    279,990x = 143,272,091,169
  5. Step 5: Solve for x
    x = 143,272,091,169/279,990
  6. Step 6: Final answer
    x = 511,704.32

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.