Home / 13,917.72-20,858.40-12,158.49

Finding the Fourth Proportional to 13,917.72, 20,858.40 and 12,158.49

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Solution

The fourth proportional to 13,917.72, 20,858.40 and 12,158.49 is: 18,221.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,917.72 : 20,858.40 = 12,158.49 : x
  2. Step 2: Convert to fraction form
    13,917.72/20,858.40 = 12,158.49/x
  3. Step 3: Cross multiply
    13,917.72x = 20,858.40 × 12,158.49
  4. Step 4: Simplify right side
    13,917.72x = 253,606,647.82
  5. Step 5: Solve for x
    x = 253,606,647.82/13,917.72
  6. Step 6: Final answer
    x = 18,221.85

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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.