Home / 5,139.90-7,697.70-3,171.60

Finding the Fourth Proportional to 5,139.90, 7,697.70 and 3,171.60

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Solution

The fourth proportional to 5,139.90, 7,697.70 and 3,171.60 is: 4,749.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,139.90 : 7,697.70 = 3,171.60 : x
  2. Step 2: Convert to fraction form
    5,139.90/7,697.70 = 3,171.60/x
  3. Step 3: Cross multiply
    5,139.90x = 7,697.70 × 3,171.60
  4. Step 4: Simplify right side
    5,139.90x = 24,414,025.32
  5. Step 5: Solve for x
    x = 24,414,025.32/5,139.90
  6. Step 6: Final answer
    x = 4,749.90

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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.