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Finding the Third Proportional to 28,139 and 43,557

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Solution

The third proportional to 28,139 and 43,557 is: 67,422.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139 : 43,557 = 43,557 : x
  2. Step 2: Convert to fraction form
    28,139/43,557 = 43,557/x
  3. Step 3: Cross multiply
    28,139x = 43,557 × 43,557
  4. Step 4: Simplify right side
    28,139x = 1,897,212,249
  5. Step 5: Solve for x
    x = 1,897,212,249/28,139
  6. Step 6: Final answer
    x = 67,422.87

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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.