Home / 20,511.35-28,305.69-11,079.91

Finding the Fourth Proportional to 20,511.35, 28,305.69 and 11,079.91

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Solution

The fourth proportional to 20,511.35, 28,305.69 and 11,079.91 is: 15,290.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,511.35 : 28,305.69 = 11,079.91 : x
  2. Step 2: Convert to fraction form
    20,511.35/28,305.69 = 11,079.91/x
  3. Step 3: Cross multiply
    20,511.35x = 28,305.69 × 11,079.91
  4. Step 4: Simplify right side
    20,511.35x = 313,624,617.87
  5. Step 5: Solve for x
    x = 313,624,617.87/20,511.35
  6. Step 6: Final answer
    x = 15,290.30

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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.