Home / 20,811.42-28,720.45-11,379.98

Finding the Fourth Proportional to 20,811.42, 28,720.45 and 11,379.98

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Solution

The fourth proportional to 20,811.42, 28,720.45 and 11,379.98 is: 15,704.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.42 : 28,720.45 = 11,379.98 : x
  2. Step 2: Convert to fraction form
    20,811.42/28,720.45 = 11,379.98/x
  3. Step 3: Cross multiply
    20,811.42x = 28,720.45 × 11,379.98
  4. Step 4: Simplify right side
    20,811.42x = 326,838,189.94
  5. Step 5: Solve for x
    x = 326,838,189.94/20,811.42
  6. Step 6: Final answer
    x = 15,704.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.