Home / 5,128.70-7,078.04-2,891.02

Finding the Fourth Proportional to 5,128.70, 7,078.04 and 2,891.02

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Solution

The fourth proportional to 5,128.70, 7,078.04 and 2,891.02 is: 3,989.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.70 : 7,078.04 = 2,891.02 : x
  2. Step 2: Convert to fraction form
    5,128.70/7,078.04 = 2,891.02/x
  3. Step 3: Cross multiply
    5,128.70x = 7,078.04 × 2,891.02
  4. Step 4: Simplify right side
    5,128.70x = 20,462,755.20
  5. Step 5: Solve for x
    x = 20,462,755.20/5,128.70
  6. Step 6: Final answer
    x = 3,989.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.