Home / 20,779.38-31,189.86-10,939.41

Finding the Fourth Proportional to 20,779.38, 31,189.86 and 10,939.41

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Solution

The fourth proportional to 20,779.38, 31,189.86 and 10,939.41 is: 16,420.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.38 : 31,189.86 = 10,939.41 : x
  2. Step 2: Convert to fraction form
    20,779.38/31,189.86 = 10,939.41/x
  3. Step 3: Cross multiply
    20,779.38x = 31,189.86 × 10,939.41
  4. Step 4: Simplify right side
    20,779.38x = 341,198,666.38
  5. Step 5: Solve for x
    x = 341,198,666.38/20,779.38
  6. Step 6: Final answer
    x = 16,420.06

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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.