Home / 15,885.20-21,921.96-8,811.92

Finding the Fourth Proportional to 15,885.20, 21,921.96 and 8,811.92

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Solution

The fourth proportional to 15,885.20, 21,921.96 and 8,811.92 is: 12,160.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.20 : 21,921.96 = 8,811.92 : x
  2. Step 2: Convert to fraction form
    15,885.20/21,921.96 = 8,811.92/x
  3. Step 3: Cross multiply
    15,885.20x = 21,921.96 × 8,811.92
  4. Step 4: Simplify right side
    15,885.20x = 193,174,557.76
  5. Step 5: Solve for x
    x = 193,174,557.76/15,885.20
  6. Step 6: Final answer
    x = 12,160.66

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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.