Home / 20,939.20-28,895.96-11,379.04

Finding the Fourth Proportional to 20,939.20, 28,895.96 and 11,379.04

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Solution

The fourth proportional to 20,939.20, 28,895.96 and 11,379.04 is: 15,703.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.20 : 28,895.96 = 11,379.04 : x
  2. Step 2: Convert to fraction form
    20,939.20/28,895.96 = 11,379.04/x
  3. Step 3: Cross multiply
    20,939.20x = 28,895.96 × 11,379.04
  4. Step 4: Simplify right side
    20,939.20x = 328,808,284.68
  5. Step 5: Solve for x
    x = 328,808,284.68/20,939.20
  6. Step 6: Final answer
    x = 15,703.00

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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.