Home / 20,917.36-31,383.87-12,603.25

Finding the Fourth Proportional to 20,917.36, 31,383.87 and 12,603.25

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Solution

The fourth proportional to 20,917.36, 31,383.87 and 12,603.25 is: 18,909.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.36 : 31,383.87 = 12,603.25 : x
  2. Step 2: Convert to fraction form
    20,917.36/31,383.87 = 12,603.25/x
  3. Step 3: Cross multiply
    20,917.36x = 31,383.87 × 12,603.25
  4. Step 4: Simplify right side
    20,917.36x = 395,538,759.58
  5. Step 5: Solve for x
    x = 395,538,759.58/20,917.36
  6. Step 6: Final answer
    x = 18,909.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.