Home / 18,869.88-28,299.96-7,779.72

Finding the Fourth Proportional to 18,869.88, 28,299.96 and 7,779.72

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Solution

The fourth proportional to 18,869.88, 28,299.96 and 7,779.72 is: 11,667.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,869.88 : 28,299.96 = 7,779.72 : x
  2. Step 2: Convert to fraction form
    18,869.88/28,299.96 = 7,779.72/x
  3. Step 3: Cross multiply
    18,869.88x = 28,299.96 × 7,779.72
  4. Step 4: Simplify right side
    18,869.88x = 220,165,764.81
  5. Step 5: Solve for x
    x = 220,165,764.81/18,869.88
  6. Step 6: Final answer
    x = 11,667.58

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1.5x scale

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.