Home / 5,385.24-8,078.40-1,921.68

Finding the Fourth Proportional to 5,385.24, 8,078.40 and 1,921.68

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Solution

The fourth proportional to 5,385.24, 8,078.40 and 1,921.68 is: 2,882.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,385.24 : 8,078.40 = 1,921.68 : x
  2. Step 2: Convert to fraction form
    5,385.24/8,078.40 = 1,921.68/x
  3. Step 3: Cross multiply
    5,385.24x = 8,078.40 × 1,921.68
  4. Step 4: Simplify right side
    5,385.24x = 15,524,099.71
  5. Step 5: Solve for x
    x = 15,524,099.71/5,385.24
  6. Step 6: Final answer
    x = 2,882.71

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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.