Home / 20,720.20-28,593.80-11,288.74

Finding the Fourth Proportional to 20,720.20, 28,593.80 and 11,288.74

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Solution

The fourth proportional to 20,720.20, 28,593.80 and 11,288.74 is: 15,578.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.20 : 28,593.80 = 11,288.74 : x
  2. Step 2: Convert to fraction form
    20,720.20/28,593.80 = 11,288.74/x
  3. Step 3: Cross multiply
    20,720.20x = 28,593.80 × 11,288.74
  4. Step 4: Simplify right side
    20,720.20x = 322,787,973.81
  5. Step 5: Solve for x
    x = 322,787,973.81/20,720.20
  6. Step 6: Final answer
    x = 15,578.42

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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.