Home / 20,933.91-28,887.12-11,979.36

Finding the Fourth Proportional to 20,933.91, 28,887.12 and 11,979.36

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Solution

The fourth proportional to 20,933.91, 28,887.12 and 11,979.36 is: 16,530.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,933.91 : 28,887.12 = 11,979.36 : x
  2. Step 2: Convert to fraction form
    20,933.91/28,887.12 = 11,979.36/x
  3. Step 3: Cross multiply
    20,933.91x = 28,887.12 × 11,979.36
  4. Step 4: Simplify right side
    20,933.91x = 346,049,209.84
  5. Step 5: Solve for x
    x = 346,049,209.84/20,933.91
  6. Step 6: Final answer
    x = 16,530.56

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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.