Home / 20,989.35-28,958.76-11,913.21

Finding the Fourth Proportional to 20,989.35, 28,958.76 and 11,913.21

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Solution

The fourth proportional to 20,989.35, 28,958.76 and 11,913.21 is: 16,436.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.35 : 28,958.76 = 11,913.21 : x
  2. Step 2: Convert to fraction form
    20,989.35/28,958.76 = 11,913.21/x
  3. Step 3: Cross multiply
    20,989.35x = 28,958.76 × 11,913.21
  4. Step 4: Simplify right side
    20,989.35x = 344,991,789.22
  5. Step 5: Solve for x
    x = 344,991,789.22/20,989.35
  6. Step 6: Final answer
    x = 16,436.52

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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.