Home / 5,424.78-8,136.20-2,138.78

Finding the Fourth Proportional to 5,424.78, 8,136.20 and 2,138.78

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Solution

The fourth proportional to 5,424.78, 8,136.20 and 2,138.78 is: 3,207.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,424.78 : 8,136.20 = 2,138.78 : x
  2. Step 2: Convert to fraction form
    5,424.78/8,136.20 = 2,138.78/x
  3. Step 3: Cross multiply
    5,424.78x = 8,136.20 × 2,138.78
  4. Step 4: Simplify right side
    5,424.78x = 17,401,541.84
  5. Step 5: Solve for x
    x = 17,401,541.84/5,424.78
  6. Step 6: Final answer
    x = 3,207.79

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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.