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Finding the Fourth Proportional to 18,669.78, 25,753.86 and 11,851.20

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Solution

The fourth proportional to 18,669.78, 25,753.86 and 11,851.20 is: 16,348.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,669.78 : 25,753.86 = 11,851.20 : x
  2. Step 2: Convert to fraction form
    18,669.78/25,753.86 = 11,851.20/x
  3. Step 3: Cross multiply
    18,669.78x = 25,753.86 × 11,851.20
  4. Step 4: Simplify right side
    18,669.78x = 305,214,145.63
  5. Step 5: Solve for x
    x = 305,214,145.63/18,669.78
  6. Step 6: Final answer
    x = 16,348.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.