Home / 20,520.81-30,781.17-11,749.62

Finding the Fourth Proportional to 20,520.81, 30,781.17 and 11,749.62

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Solution

The fourth proportional to 20,520.81, 30,781.17 and 11,749.62 is: 17,624.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,520.81 : 30,781.17 = 11,749.62 : x
  2. Step 2: Convert to fraction form
    20,520.81/30,781.17 = 11,749.62/x
  3. Step 3: Cross multiply
    20,520.81x = 30,781.17 × 11,749.62
  4. Step 4: Simplify right side
    20,520.81x = 361,667,050.66
  5. Step 5: Solve for x
    x = 361,667,050.66/20,520.81
  6. Step 6: Final answer
    x = 17,624.40

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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.