Home / 20,890.39-28,828.86-11,938.22

Finding the Fourth Proportional to 20,890.39, 28,828.86 and 11,938.22

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Solution

The fourth proportional to 20,890.39, 28,828.86 and 11,938.22 is: 16,474.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.39 : 28,828.86 = 11,938.22 : x
  2. Step 2: Convert to fraction form
    20,890.39/28,828.86 = 11,938.22/x
  3. Step 3: Cross multiply
    20,890.39x = 28,828.86 × 11,938.22
  4. Step 4: Simplify right side
    20,890.39x = 344,165,128.88
  5. Step 5: Solve for x
    x = 344,165,128.88/20,890.39
  6. Step 6: Final answer
    x = 16,474.81

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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.