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Finding the Third Proportional to 239,487 and 399,130

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Solution

The third proportional to 239,487 and 399,130 is: 665,191.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,487 : 399,130 = 399,130 : x
  2. Step 2: Convert to fraction form
    239,487/399,130 = 399,130/x
  3. Step 3: Cross multiply
    239,487x = 399,130 × 399,130
  4. Step 4: Simplify right side
    239,487x = 159,304,756,900
  5. Step 5: Solve for x
    x = 159,304,756,900/239,487
  6. Step 6: Final answer
    x = 665,191.67

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.