Home / 5,129.60-7,078.73-2,891.50

Finding the Fourth Proportional to 5,129.60, 7,078.73 and 2,891.50

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Solution

The fourth proportional to 5,129.60, 7,078.73 and 2,891.50 is: 3,990.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.60 : 7,078.73 = 2,891.50 : x
  2. Step 2: Convert to fraction form
    5,129.60/7,078.73 = 2,891.50/x
  3. Step 3: Cross multiply
    5,129.60x = 7,078.73 × 2,891.50
  4. Step 4: Simplify right side
    5,129.60x = 20,468,115.64
  5. Step 5: Solve for x
    x = 20,468,115.64/5,129.60
  6. Step 6: Final answer
    x = 3,990.20

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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.