Home / 13,799.90-20,700.50-3,939.86

Finding the Fourth Proportional to 13,799.90, 20,700.50 and 3,939.86

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Solution

The fourth proportional to 13,799.90, 20,700.50 and 3,939.86 is: 5,909.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,799.90 : 20,700.50 = 3,939.86 : x
  2. Step 2: Convert to fraction form
    13,799.90/20,700.50 = 3,939.86/x
  3. Step 3: Cross multiply
    13,799.90x = 20,700.50 × 3,939.86
  4. Step 4: Simplify right side
    13,799.90x = 81,556,978.28
  5. Step 5: Solve for x
    x = 81,556,978.28/13,799.90
  6. Step 6: Final answer
    x = 5,909.97

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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.