Home / 20,812.23-28,720.80-11,859.75

Finding the Fourth Proportional to 20,812.23, 28,720.80 and 11,859.75

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Solution

The fourth proportional to 20,812.23, 28,720.80 and 11,859.75 is: 16,366.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.23 : 28,720.80 = 11,859.75 : x
  2. Step 2: Convert to fraction form
    20,812.23/28,720.80 = 11,859.75/x
  3. Step 3: Cross multiply
    20,812.23x = 28,720.80 × 11,859.75
  4. Step 4: Simplify right side
    20,812.23x = 340,621,507.80
  5. Step 5: Solve for x
    x = 340,621,507.80/20,812.23
  6. Step 6: Final answer
    x = 16,366.41

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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.