Home / 3,979.45-5,969.90-1,311.19

Finding the Fourth Proportional to 3,979.45, 5,969.90 and 1,311.19

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Solution

The fourth proportional to 3,979.45, 5,969.90 and 1,311.19 is: 1,967.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.45 : 5,969.90 = 1,311.19 : x
  2. Step 2: Convert to fraction form
    3,979.45/5,969.90 = 1,311.19/x
  3. Step 3: Cross multiply
    3,979.45x = 5,969.90 × 1,311.19
  4. Step 4: Simplify right side
    3,979.45x = 7,827,643.33
  5. Step 5: Solve for x
    x = 7,827,643.33/3,979.45
  6. Step 6: Final answer
    x = 1,967.02

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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.