Home / 15,885.44-21,921.18-8,811.80

Finding the Fourth Proportional to 15,885.44, 21,921.18 and 8,811.80

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Solution

The fourth proportional to 15,885.44, 21,921.18 and 8,811.80 is: 12,159.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.44 : 21,921.18 = 8,811.80 : x
  2. Step 2: Convert to fraction form
    15,885.44/21,921.18 = 8,811.80/x
  3. Step 3: Cross multiply
    15,885.44x = 21,921.18 × 8,811.80
  4. Step 4: Simplify right side
    15,885.44x = 193,165,053.92
  5. Step 5: Solve for x
    x = 193,165,053.92/15,885.44
  6. Step 6: Final answer
    x = 12,159.88

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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.