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Finding the Third Proportional to 38,990 and 55,569

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Solution

The third proportional to 38,990 and 55,569 is: 79,197.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,990 : 55,569 = 55,569 : x
  2. Step 2: Convert to fraction form
    38,990/55,569 = 55,569/x
  3. Step 3: Cross multiply
    38,990x = 55,569 × 55,569
  4. Step 4: Simplify right side
    38,990x = 3,087,913,761
  5. Step 5: Solve for x
    x = 3,087,913,761/38,990
  6. Step 6: Final answer
    x = 79,197.58

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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.