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Finding the Fourth Proportional to 3,986.64, 5,979.80 and 1,064.94

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Solution

The fourth proportional to 3,986.64, 5,979.80 and 1,064.94 is: 1,597.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.64 : 5,979.80 = 1,064.94 : x
  2. Step 2: Convert to fraction form
    3,986.64/5,979.80 = 1,064.94/x
  3. Step 3: Cross multiply
    3,986.64x = 5,979.80 × 1,064.94
  4. Step 4: Simplify right side
    3,986.64x = 6,368,128.21
  5. Step 5: Solve for x
    x = 6,368,128.21/3,986.64
  6. Step 6: Final answer
    x = 1,597.37

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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.