Home / 20,928.99-28,887.30-11,979.30

Finding the Fourth Proportional to 20,928.99, 28,887.30 and 11,979.30

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Solution

The fourth proportional to 20,928.99, 28,887.30 and 11,979.30 is: 16,534.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.99 : 28,887.30 = 11,979.30 : x
  2. Step 2: Convert to fraction form
    20,928.99/28,887.30 = 11,979.30/x
  3. Step 3: Cross multiply
    20,928.99x = 28,887.30 × 11,979.30
  4. Step 4: Simplify right side
    20,928.99x = 346,049,632.89
  5. Step 5: Solve for x
    x = 346,049,632.89/20,928.99
  6. Step 6: Final answer
    x = 16,534.46

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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.