Home / 20,991.40-28,963.17-11,914.75

Finding the Fourth Proportional to 20,991.40, 28,963.17 and 11,914.75

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Solution

The fourth proportional to 20,991.40, 28,963.17 and 11,914.75 is: 16,439.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.40 : 28,963.17 = 11,914.75 : x
  2. Step 2: Convert to fraction form
    20,991.40/28,963.17 = 11,914.75/x
  3. Step 3: Cross multiply
    20,991.40x = 28,963.17 × 11,914.75
  4. Step 4: Simplify right side
    20,991.40x = 345,088,803.04
  5. Step 5: Solve for x
    x = 345,088,803.04/20,991.40
  6. Step 6: Final answer
    x = 16,439.53

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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.