Home / 20,991.22-28,967.83-11,559.78

Finding the Fourth Proportional to 20,991.22, 28,967.83 and 11,559.78

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Solution

The fourth proportional to 20,991.22, 28,967.83 and 11,559.78 is: 15,952.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.22 : 28,967.83 = 11,559.78 : x
  2. Step 2: Convert to fraction form
    20,991.22/28,967.83 = 11,559.78/x
  3. Step 3: Cross multiply
    20,991.22x = 28,967.83 × 11,559.78
  4. Step 4: Simplify right side
    20,991.22x = 334,861,712.98
  5. Step 5: Solve for x
    x = 334,861,712.98/20,991.22
  6. Step 6: Final answer
    x = 15,952.47

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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.