Home / 7,121.20-9,829.11-4,136.66

Finding the Fourth Proportional to 7,121.20, 9,829.11 and 4,136.66

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Solution

The fourth proportional to 7,121.20, 9,829.11 and 4,136.66 is: 5,709.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.20 : 9,829.11 = 4,136.66 : x
  2. Step 2: Convert to fraction form
    7,121.20/9,829.11 = 4,136.66/x
  3. Step 3: Cross multiply
    7,121.20x = 9,829.11 × 4,136.66
  4. Step 4: Simplify right side
    7,121.20x = 40,659,686.17
  5. Step 5: Solve for x
    x = 40,659,686.17/7,121.20
  6. Step 6: Final answer
    x = 5,709.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.