Home / 20,419.64-28,179.95-11,920.44

Finding the Fourth Proportional to 20,419.64, 28,179.95 and 11,920.44

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Solution

The fourth proportional to 20,419.64, 28,179.95 and 11,920.44 is: 16,450.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.64 : 28,179.95 = 11,920.44 : x
  2. Step 2: Convert to fraction form
    20,419.64/28,179.95 = 11,920.44/x
  3. Step 3: Cross multiply
    20,419.64x = 28,179.95 × 11,920.44
  4. Step 4: Simplify right side
    20,419.64x = 335,917,343.58
  5. Step 5: Solve for x
    x = 335,917,343.58/20,419.64
  6. Step 6: Final answer
    x = 16,450.70

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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.