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Finding the Fourth Proportional to 21,879.20, 32,800.80 and 9,408.80

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Solution

The fourth proportional to 21,879.20, 32,800.80 and 9,408.80 is: 14,105.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.20 : 32,800.80 = 9,408.80 : x
  2. Step 2: Convert to fraction form
    21,879.20/32,800.80 = 9,408.80/x
  3. Step 3: Cross multiply
    21,879.20x = 32,800.80 × 9,408.80
  4. Step 4: Simplify right side
    21,879.20x = 308,616,167.04
  5. Step 5: Solve for x
    x = 308,616,167.04/21,879.20
  6. Step 6: Final answer
    x = 14,105.46

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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.