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Finding the Third Proportional to 12,821,989.50 and 19,917,272.25

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Solution

The third proportional to 12,821,989.50 and 19,917,272.25 is: 30,938,859.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,821,989.50 : 19,917,272.25 = 19,917,272.25 : x
  2. Step 2: Convert to fraction form
    12,821,989.50/19,917,272.25 = 19,917,272.25/x
  3. Step 3: Cross multiply
    12,821,989.50x = 19,917,272.25 × 19,917,272.25
  4. Step 4: Simplify right side
    12,821,989.50x = 396,697,733,880,620.06
  5. Step 5: Solve for x
    x = 396,697,733,880,620.06/12,821,989.50
  6. Step 6: Final answer
    x = 30,938,859.67

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.