Home / 20,382.99-28,129.68-15,338.16

Finding the Fourth Proportional to 20,382.99, 28,129.68 and 15,338.16

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Solution

The fourth proportional to 20,382.99, 28,129.68 and 15,338.16 is: 21,167.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,382.99 : 28,129.68 = 15,338.16 : x
  2. Step 2: Convert to fraction form
    20,382.99/28,129.68 = 15,338.16/x
  3. Step 3: Cross multiply
    20,382.99x = 28,129.68 × 15,338.16
  4. Step 4: Simplify right side
    20,382.99x = 431,457,532.59
  5. Step 5: Solve for x
    x = 431,457,532.59/20,382.99
  6. Step 6: Final answer
    x = 21,167.53

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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.