Home / 20,639.10-28,480.38-12,141.56

Finding the Fourth Proportional to 20,639.10, 28,480.38 and 12,141.56

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Solution

The fourth proportional to 20,639.10, 28,480.38 and 12,141.56 is: 16,754.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.10 : 28,480.38 = 12,141.56 : x
  2. Step 2: Convert to fraction form
    20,639.10/28,480.38 = 12,141.56/x
  3. Step 3: Cross multiply
    20,639.10x = 28,480.38 × 12,141.56
  4. Step 4: Simplify right side
    20,639.10x = 345,796,242.59
  5. Step 5: Solve for x
    x = 345,796,242.59/20,639.10
  6. Step 6: Final answer
    x = 16,754.42

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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.