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Finding the Third Proportional to 515,109 and 787,972.50

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Solution

The third proportional to 515,109 and 787,972.50 is: 1,205,377.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,109 : 787,972.50 = 787,972.50 : x
  2. Step 2: Convert to fraction form
    515,109/787,972.50 = 787,972.50/x
  3. Step 3: Cross multiply
    515,109x = 787,972.50 × 787,972.50
  4. Step 4: Simplify right side
    515,109x = 620,900,660,756.25
  5. Step 5: Solve for x
    x = 620,900,660,756.25/515,109
  6. Step 6: Final answer
    x = 1,205,377.23

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.