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Finding the Fourth Proportional to 18,801.72, 28,171.80 and 11,408.45

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Solution

The fourth proportional to 18,801.72, 28,171.80 and 11,408.45 is: 17,093.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,801.72 : 28,171.80 = 11,408.45 : x
  2. Step 2: Convert to fraction form
    18,801.72/28,171.80 = 11,408.45/x
  3. Step 3: Cross multiply
    18,801.72x = 28,171.80 × 11,408.45
  4. Step 4: Simplify right side
    18,801.72x = 321,396,430.85
  5. Step 5: Solve for x
    x = 321,396,430.85/18,801.72
  6. Step 6: Final answer
    x = 17,093.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.