Home / 20,939.40-28,895.86-11,986.32

Finding the Fourth Proportional to 20,939.40, 28,895.86 and 11,986.32

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Solution

The fourth proportional to 20,939.40, 28,895.86 and 11,986.32 is: 16,540.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.40 : 28,895.86 = 11,986.32 : x
  2. Step 2: Convert to fraction form
    20,939.40/28,895.86 = 11,986.32/x
  3. Step 3: Cross multiply
    20,939.40x = 28,895.86 × 11,986.32
  4. Step 4: Simplify right side
    20,939.40x = 346,355,024.64
  5. Step 5: Solve for x
    x = 346,355,024.64/20,939.40
  6. Step 6: Final answer
    x = 16,540.83

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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.