Home / 13,121.68-19,664.90-7,189.64

Finding the Fourth Proportional to 13,121.68, 19,664.90 and 7,189.64

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Solution

The fourth proportional to 13,121.68, 19,664.90 and 7,189.64 is: 10,774.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.68 : 19,664.90 = 7,189.64 : x
  2. Step 2: Convert to fraction form
    13,121.68/19,664.90 = 7,189.64/x
  3. Step 3: Cross multiply
    13,121.68x = 19,664.90 × 7,189.64
  4. Step 4: Simplify right side
    13,121.68x = 141,383,564.85
  5. Step 5: Solve for x
    x = 141,383,564.85/13,121.68
  6. Step 6: Final answer
    x = 10,774.81

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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.