Home / 20,939.63-28,896.75-11,379.60

Finding the Fourth Proportional to 20,939.63, 28,896.75 and 11,379.60

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Solution

The fourth proportional to 20,939.63, 28,896.75 and 11,379.60 is: 15,703.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.63 : 28,896.75 = 11,379.60 : x
  2. Step 2: Convert to fraction form
    20,939.63/28,896.75 = 11,379.60/x
  3. Step 3: Cross multiply
    20,939.63x = 28,896.75 × 11,379.60
  4. Step 4: Simplify right side
    20,939.63x = 328,833,456.30
  5. Step 5: Solve for x
    x = 328,833,456.30/20,939.63
  6. Step 6: Final answer
    x = 15,703.88

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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.