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Finding the Fourth Proportional to 3,979.76, 5,969.64 and 1,382.69

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Solution

The fourth proportional to 3,979.76, 5,969.64 and 1,382.69 is: 2,074.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.76 : 5,969.64 = 1,382.69 : x
  2. Step 2: Convert to fraction form
    3,979.76/5,969.64 = 1,382.69/x
  3. Step 3: Cross multiply
    3,979.76x = 5,969.64 × 1,382.69
  4. Step 4: Simplify right side
    3,979.76x = 8,254,161.53
  5. Step 5: Solve for x
    x = 8,254,161.53/3,979.76
  6. Step 6: Final answer
    x = 2,074.04

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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.