Home / 5,420.78-8,131.56-2,649.76

Finding the Fourth Proportional to 5,420.78, 8,131.56 and 2,649.76

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Solution

The fourth proportional to 5,420.78, 8,131.56 and 2,649.76 is: 3,974.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.78 : 8,131.56 = 2,649.76 : x
  2. Step 2: Convert to fraction form
    5,420.78/8,131.56 = 2,649.76/x
  3. Step 3: Cross multiply
    5,420.78x = 8,131.56 × 2,649.76
  4. Step 4: Simplify right side
    5,420.78x = 21,546,682.43
  5. Step 5: Solve for x
    x = 21,546,682.43/5,420.78
  6. Step 6: Final answer
    x = 3,974.83

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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.