Home / 20,857.15-28,780.92-11,904.57

Finding the Fourth Proportional to 20,857.15, 28,780.92 and 11,904.57

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Solution

The fourth proportional to 20,857.15, 28,780.92 and 11,904.57 is: 16,427.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.15 : 28,780.92 = 11,904.57 : x
  2. Step 2: Convert to fraction form
    20,857.15/28,780.92 = 11,904.57/x
  3. Step 3: Cross multiply
    20,857.15x = 28,780.92 × 11,904.57
  4. Step 4: Simplify right side
    20,857.15x = 342,624,476.80
  5. Step 5: Solve for x
    x = 342,624,476.80/20,857.15
  6. Step 6: Final answer
    x = 16,427.20

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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.