Home / 20,790.72-28,691.55-11,360.70

Finding the Fourth Proportional to 20,790.72, 28,691.55 and 11,360.70

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Solution

The fourth proportional to 20,790.72, 28,691.55 and 11,360.70 is: 15,677.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.72 : 28,691.55 = 11,360.70 : x
  2. Step 2: Convert to fraction form
    20,790.72/28,691.55 = 11,360.70/x
  3. Step 3: Cross multiply
    20,790.72x = 28,691.55 × 11,360.70
  4. Step 4: Simplify right side
    20,790.72x = 325,956,092.09
  5. Step 5: Solve for x
    x = 325,956,092.09/20,790.72
  6. Step 6: Final answer
    x = 15,677.96

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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.