Home / 13,914.86-20,870.07-5,147.78

Finding the Fourth Proportional to 13,914.86, 20,870.07 and 5,147.78

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Solution

The fourth proportional to 13,914.86, 20,870.07 and 5,147.78 is: 7,720.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,914.86 : 20,870.07 = 5,147.78 : x
  2. Step 2: Convert to fraction form
    13,914.86/20,870.07 = 5,147.78/x
  3. Step 3: Cross multiply
    13,914.86x = 20,870.07 × 5,147.78
  4. Step 4: Simplify right side
    13,914.86x = 107,434,528.94
  5. Step 5: Solve for x
    x = 107,434,528.94/13,914.86
  6. Step 6: Final answer
    x = 7,720.85

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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.