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Finding the Third Proportional to 15,331.78 and 21,885.19

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Solution

The third proportional to 15,331.78 and 21,885.19 is: 31,239.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,331.78 : 21,885.19 = 21,885.19 : x
  2. Step 2: Convert to fraction form
    15,331.78/21,885.19 = 21,885.19/x
  3. Step 3: Cross multiply
    15,331.78x = 21,885.19 × 21,885.19
  4. Step 4: Simplify right side
    15,331.78x = 478,961,431.91
  5. Step 5: Solve for x
    x = 478,961,431.91/15,331.78
  6. Step 6: Final answer
    x = 31,239.78

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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.