Home / 20,919.74-31,380.21-6,128.67

Finding the Fourth Proportional to 20,919.74, 31,380.21 and 6,128.67

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Solution

The fourth proportional to 20,919.74, 31,380.21 and 6,128.67 is: 9,193.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.74 : 31,380.21 = 6,128.67 : x
  2. Step 2: Convert to fraction form
    20,919.74/31,380.21 = 6,128.67/x
  3. Step 3: Cross multiply
    20,919.74x = 31,380.21 × 6,128.67
  4. Step 4: Simplify right side
    20,919.74x = 192,318,920.98
  5. Step 5: Solve for x
    x = 192,318,920.98/20,919.74
  6. Step 6: Final answer
    x = 9,193.18

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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.