Home / 20,660.90-30,981.11-8,812.85

Finding the Fourth Proportional to 20,660.90, 30,981.11 and 8,812.85

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Solution

The fourth proportional to 20,660.90, 30,981.11 and 8,812.85 is: 13,214.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,660.90 : 30,981.11 = 8,812.85 : x
  2. Step 2: Convert to fraction form
    20,660.90/30,981.11 = 8,812.85/x
  3. Step 3: Cross multiply
    20,660.90x = 30,981.11 × 8,812.85
  4. Step 4: Simplify right side
    20,660.90x = 273,031,676.29
  5. Step 5: Solve for x
    x = 273,031,676.29/20,660.90
  6. Step 6: Final answer
    x = 13,214.90

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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.