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Finding the Fourth Proportional to 3,992, 5,988.96 and 1,256

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Solution

The fourth proportional to 3,992, 5,988.96 and 1,256 is: 1,884.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,992 : 5,988.96 = 1,256 : x
  2. Step 2: Convert to fraction form
    3,992/5,988.96 = 1,256/x
  3. Step 3: Cross multiply
    3,992x = 5,988.96 × 1,256
  4. Step 4: Simplify right side
    3,992x = 7,522,133.76
  5. Step 5: Solve for x
    x = 7,522,133.76/3,992
  6. Step 6: Final answer
    x = 1,884.30

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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.