Home / 20,872.32-28,803.84-11,440.80

Finding the Fourth Proportional to 20,872.32, 28,803.84 and 11,440.80

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Solution

The fourth proportional to 20,872.32, 28,803.84 and 11,440.80 is: 15,788.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.32 : 28,803.84 = 11,440.80 : x
  2. Step 2: Convert to fraction form
    20,872.32/28,803.84 = 11,440.80/x
  3. Step 3: Cross multiply
    20,872.32x = 28,803.84 × 11,440.80
  4. Step 4: Simplify right side
    20,872.32x = 329,538,972.67
  5. Step 5: Solve for x
    x = 329,538,972.67/20,872.32
  6. Step 6: Final answer
    x = 15,788.33

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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.