Home / 20,371.12-28,112.32-11,418.64

Finding the Fourth Proportional to 20,371.12, 28,112.32 and 11,418.64

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Solution

The fourth proportional to 20,371.12, 28,112.32 and 11,418.64 is: 15,757.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,371.12 : 28,112.32 = 11,418.64 : x
  2. Step 2: Convert to fraction form
    20,371.12/28,112.32 = 11,418.64/x
  3. Step 3: Cross multiply
    20,371.12x = 28,112.32 × 11,418.64
  4. Step 4: Simplify right side
    20,371.12x = 321,004,461.64
  5. Step 5: Solve for x
    x = 321,004,461.64/20,371.12
  6. Step 6: Final answer
    x = 15,757.82

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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.