Home / 20,872.20-28,803.57-11,312.37

Finding the Fourth Proportional to 20,872.20, 28,803.57 and 11,312.37

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Solution

The fourth proportional to 20,872.20, 28,803.57 and 11,312.37 is: 15,611.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.20 : 28,803.57 = 11,312.37 : x
  2. Step 2: Convert to fraction form
    20,872.20/28,803.57 = 11,312.37/x
  3. Step 3: Cross multiply
    20,872.20x = 28,803.57 × 11,312.37
  4. Step 4: Simplify right side
    20,872.20x = 325,836,641.16
  5. Step 5: Solve for x
    x = 325,836,641.16/20,872.20
  6. Step 6: Final answer
    x = 15,611.03

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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.