Home / 20,704.60-31,089.30-15,779.80

Finding the Fourth Proportional to 20,704.60, 31,089.30 and 15,779.80

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Solution

The fourth proportional to 20,704.60, 31,089.30 and 15,779.80 is: 23,694.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,704.60 : 31,089.30 = 15,779.80 : x
  2. Step 2: Convert to fraction form
    20,704.60/31,089.30 = 15,779.80/x
  3. Step 3: Cross multiply
    20,704.60x = 31,089.30 × 15,779.80
  4. Step 4: Simplify right side
    20,704.60x = 490,582,936.14
  5. Step 5: Solve for x
    x = 490,582,936.14/20,704.60
  6. Step 6: Final answer
    x = 23,694.39

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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.