Home / 5,421.36-8,128.84-2,131.76

Finding the Fourth Proportional to 5,421.36, 8,128.84 and 2,131.76

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Solution

The fourth proportional to 5,421.36, 8,128.84 and 2,131.76 is: 3,196.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,421.36 : 8,128.84 = 2,131.76 : x
  2. Step 2: Convert to fraction form
    5,421.36/8,128.84 = 2,131.76/x
  3. Step 3: Cross multiply
    5,421.36x = 8,128.84 × 2,131.76
  4. Step 4: Simplify right side
    5,421.36x = 17,328,735.96
  5. Step 5: Solve for x
    x = 17,328,735.96/5,421.36
  6. Step 6: Final answer
    x = 3,196.38

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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.