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Finding the Fourth Proportional to 10,991.70, 16,480.84 and 4,320.20

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Solution

The fourth proportional to 10,991.70, 16,480.84 and 4,320.20 is: 6,477.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,991.70 : 16,480.84 = 4,320.20 : x
  2. Step 2: Convert to fraction form
    10,991.70/16,480.84 = 4,320.20/x
  3. Step 3: Cross multiply
    10,991.70x = 16,480.84 × 4,320.20
  4. Step 4: Simplify right side
    10,991.70x = 71,200,524.97
  5. Step 5: Solve for x
    x = 71,200,524.97/10,991.70
  6. Step 6: Final answer
    x = 6,477.66

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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.