Home / 13,609.20-18,780.60-7,640.88

Finding the Fourth Proportional to 13,609.20, 18,780.60 and 7,640.88

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Solution

The fourth proportional to 13,609.20, 18,780.60 and 7,640.88 is: 10,544.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.20 : 18,780.60 = 7,640.88 : x
  2. Step 2: Convert to fraction form
    13,609.20/18,780.60 = 7,640.88/x
  3. Step 3: Cross multiply
    13,609.20x = 18,780.60 × 7,640.88
  4. Step 4: Simplify right side
    13,609.20x = 143,500,310.93
  5. Step 5: Solve for x
    x = 143,500,310.93/13,609.20
  6. Step 6: Final answer
    x = 10,544.36

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1.5x scale

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.