Home / 20,930.59-28,883.82-11,978.74

Finding the Fourth Proportional to 20,930.59, 28,883.82 and 11,978.74

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Solution

The fourth proportional to 20,930.59, 28,883.82 and 11,978.74 is: 16,530.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.59 : 28,883.82 = 11,978.74 : x
  2. Step 2: Convert to fraction form
    20,930.59/28,883.82 = 11,978.74/x
  3. Step 3: Cross multiply
    20,930.59x = 28,883.82 × 11,978.74
  4. Step 4: Simplify right side
    20,930.59x = 345,991,769.99
  5. Step 5: Solve for x
    x = 345,991,769.99/20,930.59
  6. Step 6: Final answer
    x = 16,530.44

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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.