Home / 20,382.93-28,128.11-11,889.99

Finding the Fourth Proportional to 20,382.93, 28,128.11 and 11,889.99

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Solution

The fourth proportional to 20,382.93, 28,128.11 and 11,889.99 is: 16,407.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,382.93 : 28,128.11 = 11,889.99 : x
  2. Step 2: Convert to fraction form
    20,382.93/28,128.11 = 11,889.99/x
  3. Step 3: Cross multiply
    20,382.93x = 28,128.11 × 11,889.99
  4. Step 4: Simplify right side
    20,382.93x = 334,442,887.17
  5. Step 5: Solve for x
    x = 334,442,887.17/20,382.93
  6. Step 6: Final answer
    x = 16,407.99

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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.