Home / 13,865.86-20,741.52-12,687.10

Finding the Fourth Proportional to 13,865.86, 20,741.52 and 12,687.10

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Solution

The fourth proportional to 13,865.86, 20,741.52 and 12,687.10 is: 18,978.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,865.86 : 20,741.52 = 12,687.10 : x
  2. Step 2: Convert to fraction form
    13,865.86/20,741.52 = 12,687.10/x
  3. Step 3: Cross multiply
    13,865.86x = 20,741.52 × 12,687.10
  4. Step 4: Simplify right side
    13,865.86x = 263,149,738.39
  5. Step 5: Solve for x
    x = 263,149,738.39/13,865.86
  6. Step 6: Final answer
    x = 18,978.25

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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.