Home / 20,142.82-30,209.66-7,658.40

Finding the Fourth Proportional to 20,142.82, 30,209.66 and 7,658.40

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Solution

The fourth proportional to 20,142.82, 30,209.66 and 7,658.40 is: 11,485.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,142.82 : 30,209.66 = 7,658.40 : x
  2. Step 2: Convert to fraction form
    20,142.82/30,209.66 = 7,658.40/x
  3. Step 3: Cross multiply
    20,142.82x = 30,209.66 × 7,658.40
  4. Step 4: Simplify right side
    20,142.82x = 231,357,660.14
  5. Step 5: Solve for x
    x = 231,357,660.14/20,142.82
  6. Step 6: Final answer
    x = 11,485.86

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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.