Home / 13,909.79-20,864.48-3,379.89

Finding the Fourth Proportional to 13,909.79, 20,864.48 and 3,379.89

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Solution

The fourth proportional to 13,909.79, 20,864.48 and 3,379.89 is: 5,069.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,909.79 : 20,864.48 = 3,379.89 : x
  2. Step 2: Convert to fraction form
    13,909.79/20,864.48 = 3,379.89/x
  3. Step 3: Cross multiply
    13,909.79x = 20,864.48 × 3,379.89
  4. Step 4: Simplify right side
    13,909.79x = 70,519,647.31
  5. Step 5: Solve for x
    x = 70,519,647.31/13,909.79
  6. Step 6: Final answer
    x = 5,069.79

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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.