Home / 20,940.82-28,902.89-12,881.41

Finding the Fourth Proportional to 20,940.82, 28,902.89 and 12,881.41

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Solution

The fourth proportional to 20,940.82, 28,902.89 and 12,881.41 is: 17,779.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.82 : 28,902.89 = 12,881.41 : x
  2. Step 2: Convert to fraction form
    20,940.82/28,902.89 = 12,881.41/x
  3. Step 3: Cross multiply
    20,940.82x = 28,902.89 × 12,881.41
  4. Step 4: Simplify right side
    20,940.82x = 372,309,936.22
  5. Step 5: Solve for x
    x = 372,309,936.22/20,940.82
  6. Step 6: Final answer
    x = 17,779.15

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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.