Home / 20,961.60-28,914.32-12,896.60

Finding the Fourth Proportional to 20,961.60, 28,914.32 and 12,896.60

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Solution

The fourth proportional to 20,961.60, 28,914.32 and 12,896.60 is: 17,789.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.60 : 28,914.32 = 12,896.60 : x
  2. Step 2: Convert to fraction form
    20,961.60/28,914.32 = 12,896.60/x
  3. Step 3: Cross multiply
    20,961.60x = 28,914.32 × 12,896.60
  4. Step 4: Simplify right side
    20,961.60x = 372,896,419.31
  5. Step 5: Solve for x
    x = 372,896,419.31/20,961.60
  6. Step 6: Final answer
    x = 17,789.50

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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.