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Finding the Third Proportional to 389,866.50 and 620,286.75

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Solution

The third proportional to 389,866.50 and 620,286.75 is: 986,890.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,866.50 : 620,286.75 = 620,286.75 : x
  2. Step 2: Convert to fraction form
    389,866.50/620,286.75 = 620,286.75/x
  3. Step 3: Cross multiply
    389,866.50x = 620,286.75 × 620,286.75
  4. Step 4: Simplify right side
    389,866.50x = 384,755,652,225.56
  5. Step 5: Solve for x
    x = 384,755,652,225.56/389,866.50
  6. Step 6: Final answer
    x = 986,890.77

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.