Home / 20,620.87-28,457.43-12,121.43

Finding the Fourth Proportional to 20,620.87, 28,457.43 and 12,121.43

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Solution

The fourth proportional to 20,620.87, 28,457.43 and 12,121.43 is: 16,727.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.87 : 28,457.43 = 12,121.43 : x
  2. Step 2: Convert to fraction form
    20,620.87/28,457.43 = 12,121.43/x
  3. Step 3: Cross multiply
    20,620.87x = 28,457.43 × 12,121.43
  4. Step 4: Simplify right side
    20,620.87x = 344,944,715.42
  5. Step 5: Solve for x
    x = 344,944,715.42/20,620.87
  6. Step 6: Final answer
    x = 16,727.94

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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.