Home / 20,382.62-28,128.29-12,315.15

Finding the Fourth Proportional to 20,382.62, 28,128.29 and 12,315.15

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Solution

The fourth proportional to 20,382.62, 28,128.29 and 12,315.15 is: 16,995.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,382.62 : 28,128.29 = 12,315.15 : x
  2. Step 2: Convert to fraction form
    20,382.62/28,128.29 = 12,315.15/x
  3. Step 3: Cross multiply
    20,382.62x = 28,128.29 × 12,315.15
  4. Step 4: Simplify right side
    20,382.62x = 346,404,049.02
  5. Step 5: Solve for x
    x = 346,404,049.02/20,382.62
  6. Step 6: Final answer
    x = 16,995.07

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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.