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Finding the Third Proportional to 21,245 and 31,115.50

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Solution

The third proportional to 21,245 and 31,115.50 is: 45,571.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,245 : 31,115.50 = 31,115.50 : x
  2. Step 2: Convert to fraction form
    21,245/31,115.50 = 31,115.50/x
  3. Step 3: Cross multiply
    21,245x = 31,115.50 × 31,115.50
  4. Step 4: Simplify right side
    21,245x = 968,174,340.25
  5. Step 5: Solve for x
    x = 968,174,340.25/21,245
  6. Step 6: Final answer
    x = 45,571.87

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.