Home / 20,939.85-28,896.39-11,987.04

Finding the Fourth Proportional to 20,939.85, 28,896.39 and 11,987.04

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Solution

The fourth proportional to 20,939.85, 28,896.39 and 11,987.04 is: 16,541.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.85 : 28,896.39 = 11,987.04 : x
  2. Step 2: Convert to fraction form
    20,939.85/28,896.39 = 11,987.04/x
  3. Step 3: Cross multiply
    20,939.85x = 28,896.39 × 11,987.04
  4. Step 4: Simplify right side
    20,939.85x = 346,382,182.79
  5. Step 5: Solve for x
    x = 346,382,182.79/20,939.85
  6. Step 6: Final answer
    x = 16,541.77

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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.