Home / 5,415.17-8,121.35-2,128.28

Finding the Fourth Proportional to 5,415.17, 8,121.35 and 2,128.28

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Solution

The fourth proportional to 5,415.17, 8,121.35 and 2,128.28 is: 3,191.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,415.17 : 8,121.35 = 2,128.28 : x
  2. Step 2: Convert to fraction form
    5,415.17/8,121.35 = 2,128.28/x
  3. Step 3: Cross multiply
    5,415.17x = 8,121.35 × 2,128.28
  4. Step 4: Simplify right side
    5,415.17x = 17,284,471.49
  5. Step 5: Solve for x
    x = 17,284,471.49/5,415.17
  6. Step 6: Final answer
    x = 3,191.86

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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.