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Finding the Third Proportional to 215,289 and 320,472

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Solution

The third proportional to 215,289 and 320,472 is: 477,043.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,289 : 320,472 = 320,472 : x
  2. Step 2: Convert to fraction form
    215,289/320,472 = 320,472/x
  3. Step 3: Cross multiply
    215,289x = 320,472 × 320,472
  4. Step 4: Simplify right side
    215,289x = 102,702,302,784
  5. Step 5: Solve for x
    x = 102,702,302,784/215,289
  6. Step 6: Final answer
    x = 477,043.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.