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Finding the Third Proportional to 21,190.75 and 31,138

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Solution

The third proportional to 21,190.75 and 31,138 is: 45,754.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,190.75 : 31,138 = 31,138 : x
  2. Step 2: Convert to fraction form
    21,190.75/31,138 = 31,138/x
  3. Step 3: Cross multiply
    21,190.75x = 31,138 × 31,138
  4. Step 4: Simplify right side
    21,190.75x = 969,575,044
  5. Step 5: Solve for x
    x = 969,575,044/21,190.75
  6. Step 6: Final answer
    x = 45,754.64

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.