Home / 13,855.20-20,779.56-5,085.36

Finding the Fourth Proportional to 13,855.20, 20,779.56 and 5,085.36

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Solution

The fourth proportional to 13,855.20, 20,779.56 and 5,085.36 is: 7,626.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,855.20 : 20,779.56 = 5,085.36 : x
  2. Step 2: Convert to fraction form
    13,855.20/20,779.56 = 5,085.36/x
  3. Step 3: Cross multiply
    13,855.20x = 20,779.56 × 5,085.36
  4. Step 4: Simplify right side
    13,855.20x = 105,671,543.24
  5. Step 5: Solve for x
    x = 105,671,543.24/13,855.20
  6. Step 6: Final answer
    x = 7,626.85

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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.