Home / 20,939.42-28,896.32-11,987.08

Finding the Fourth Proportional to 20,939.42, 28,896.32 and 11,987.08

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Solution

The fourth proportional to 20,939.42, 28,896.32 and 11,987.08 is: 16,542.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.42 : 28,896.32 = 11,987.08 : x
  2. Step 2: Convert to fraction form
    20,939.42/28,896.32 = 11,987.08/x
  3. Step 3: Cross multiply
    20,939.42x = 28,896.32 × 11,987.08
  4. Step 4: Simplify right side
    20,939.42x = 346,382,499.55
  5. Step 5: Solve for x
    x = 346,382,499.55/20,939.42
  6. Step 6: Final answer
    x = 16,542.12

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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.