Home / 20,511.87-28,315.83-12,012.81

Finding the Fourth Proportional to 20,511.87, 28,315.83 and 12,012.81

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Solution

The fourth proportional to 20,511.87, 28,315.83 and 12,012.81 is: 16,583.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,511.87 : 28,315.83 = 12,012.81 : x
  2. Step 2: Convert to fraction form
    20,511.87/28,315.83 = 12,012.81/x
  3. Step 3: Cross multiply
    20,511.87x = 28,315.83 × 12,012.81
  4. Step 4: Simplify right side
    20,511.87x = 340,152,685.78
  5. Step 5: Solve for x
    x = 340,152,685.78/20,511.87
  6. Step 6: Final answer
    x = 16,583.21

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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.