Home / 15,121.32-20,786.69-13,511.08

Finding the Fourth Proportional to 15,121.32, 20,786.69 and 13,511.08

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Solution

The fourth proportional to 15,121.32, 20,786.69 and 13,511.08 is: 18,573.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.32 : 20,786.69 = 13,511.08 : x
  2. Step 2: Convert to fraction form
    15,121.32/20,786.69 = 13,511.08/x
  3. Step 3: Cross multiply
    15,121.32x = 20,786.69 × 13,511.08
  4. Step 4: Simplify right side
    15,121.32x = 280,850,631.53
  5. Step 5: Solve for x
    x = 280,850,631.53/15,121.32
  6. Step 6: Final answer
    x = 18,573.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.