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Finding the Fourth Proportional to 18,771.88, 25,905.22 and 10,388.20

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Solution

The fourth proportional to 18,771.88, 25,905.22 and 10,388.20 is: 14,335.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,771.88 : 25,905.22 = 10,388.20 : x
  2. Step 2: Convert to fraction form
    18,771.88/25,905.22 = 10,388.20/x
  3. Step 3: Cross multiply
    18,771.88x = 25,905.22 × 10,388.20
  4. Step 4: Simplify right side
    18,771.88x = 269,108,606.40
  5. Step 5: Solve for x
    x = 269,108,606.40/18,771.88
  6. Step 6: Final answer
    x = 14,335.73

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1.5x scale

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.