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Finding the Fourth Proportional to 3,986.16, 5,979.24 and 1,356.64

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Solution

The fourth proportional to 3,986.16, 5,979.24 and 1,356.64 is: 2,034.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.16 : 5,979.24 = 1,356.64 : x
  2. Step 2: Convert to fraction form
    3,986.16/5,979.24 = 1,356.64/x
  3. Step 3: Cross multiply
    3,986.16x = 5,979.24 × 1,356.64
  4. Step 4: Simplify right side
    3,986.16x = 8,111,676.15
  5. Step 5: Solve for x
    x = 8,111,676.15/3,986.16
  6. Step 6: Final answer
    x = 2,034.96

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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.