Home / 20,991.86-31,487.69-8,511.83

Finding the Fourth Proportional to 20,991.86, 31,487.69 and 8,511.83

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Solution

The fourth proportional to 20,991.86, 31,487.69 and 8,511.83 is: 12,767.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.86 : 31,487.69 = 8,511.83 : x
  2. Step 2: Convert to fraction form
    20,991.86/31,487.69 = 8,511.83/x
  3. Step 3: Cross multiply
    20,991.86x = 31,487.69 × 8,511.83
  4. Step 4: Simplify right side
    20,991.86x = 268,017,975.53
  5. Step 5: Solve for x
    x = 268,017,975.53/20,991.86
  6. Step 6: Final answer
    x = 12,767.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.