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Finding the Third Proportional to 210,438 and 315,900

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Solution

The third proportional to 210,438 and 315,900 is: 474,214.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,438 : 315,900 = 315,900 : x
  2. Step 2: Convert to fraction form
    210,438/315,900 = 315,900/x
  3. Step 3: Cross multiply
    210,438x = 315,900 × 315,900
  4. Step 4: Simplify right side
    210,438x = 99,792,810,000
  5. Step 5: Solve for x
    x = 99,792,810,000/210,438
  6. Step 6: Final answer
    x = 474,214.78

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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.