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Finding the Fourth Proportional to 7,136.40, 10,704.40 and 3,240.80

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Solution

The fourth proportional to 7,136.40, 10,704.40 and 3,240.80 is: 4,861.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,136.40 : 10,704.40 = 3,240.80 : x
  2. Step 2: Convert to fraction form
    7,136.40/10,704.40 = 3,240.80/x
  3. Step 3: Cross multiply
    7,136.40x = 10,704.40 × 3,240.80
  4. Step 4: Simplify right side
    7,136.40x = 34,690,819.52
  5. Step 5: Solve for x
    x = 34,690,819.52/7,136.40
  6. Step 6: Final answer
    x = 4,861.11

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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.