Home / 20,129.72-30,142.94-19,538.62

Finding the Fourth Proportional to 20,129.72, 30,142.94 and 19,538.62

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Solution

The fourth proportional to 20,129.72, 30,142.94 and 19,538.62 is: 29,257.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.72 : 30,142.94 = 19,538.62 : x
  2. Step 2: Convert to fraction form
    20,129.72/30,142.94 = 19,538.62/x
  3. Step 3: Cross multiply
    20,129.72x = 30,142.94 × 19,538.62
  4. Step 4: Simplify right side
    20,129.72x = 588,951,277.29
  5. Step 5: Solve for x
    x = 588,951,277.29/20,129.72
  6. Step 6: Final answer
    x = 29,257.81

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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.