Home / 20,685.86-28,575.32-19,917.77

Finding the Fourth Proportional to 20,685.86, 28,575.32 and 19,917.77

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Solution

The fourth proportional to 20,685.86, 28,575.32 and 19,917.77 is: 27,514.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.86 : 28,575.32 = 19,917.77 : x
  2. Step 2: Convert to fraction form
    20,685.86/28,575.32 = 19,917.77/x
  3. Step 3: Cross multiply
    20,685.86x = 28,575.32 × 19,917.77
  4. Step 4: Simplify right side
    20,685.86x = 569,156,408.97
  5. Step 5: Solve for x
    x = 569,156,408.97/20,685.86
  6. Step 6: Final answer
    x = 27,514.27

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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.