Home / 20,779.67-28,675.96-12,821.90

Finding the Fourth Proportional to 20,779.67, 28,675.96 and 12,821.90

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Solution

The fourth proportional to 20,779.67, 28,675.96 and 12,821.90 is: 17,694.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.67 : 28,675.96 = 12,821.90 : x
  2. Step 2: Convert to fraction form
    20,779.67/28,675.96 = 12,821.90/x
  3. Step 3: Cross multiply
    20,779.67x = 28,675.96 × 12,821.90
  4. Step 4: Simplify right side
    20,779.67x = 367,680,116.09
  5. Step 5: Solve for x
    x = 367,680,116.09/20,779.67
  6. Step 6: Final answer
    x = 17,694.22

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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.