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Finding the Third Proportional to 318,500.25 and 690,136.50

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Solution

The third proportional to 318,500.25 and 690,136.50 is: 1,495,409.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,500.25 : 690,136.50 = 690,136.50 : x
  2. Step 2: Convert to fraction form
    318,500.25/690,136.50 = 690,136.50/x
  3. Step 3: Cross multiply
    318,500.25x = 690,136.50 × 690,136.50
  4. Step 4: Simplify right side
    318,500.25x = 476,288,388,632.25
  5. Step 5: Solve for x
    x = 476,288,388,632.25/318,500.25
  6. Step 6: Final answer
    x = 1,495,409.78

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.