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Finding the Third Proportional to 13,990 and 19,940

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Solution

The third proportional to 13,990 and 19,940 is: 28,420.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990 : 19,940 = 19,940 : x
  2. Step 2: Convert to fraction form
    13,990/19,940 = 19,940/x
  3. Step 3: Cross multiply
    13,990x = 19,940 × 19,940
  4. Step 4: Simplify right side
    13,990x = 397,603,600
  5. Step 5: Solve for x
    x = 397,603,600/13,990
  6. Step 6: Final answer
    x = 28,420.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.