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Finding the Fourth Proportional to 3,992.92, 5,989.34 and 1,071.40

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Solution

The fourth proportional to 3,992.92, 5,989.34 and 1,071.40 is: 1,607.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,992.92 : 5,989.34 = 1,071.40 : x
  2. Step 2: Convert to fraction form
    3,992.92/5,989.34 = 1,071.40/x
  3. Step 3: Cross multiply
    3,992.92x = 5,989.34 × 1,071.40
  4. Step 4: Simplify right side
    3,992.92x = 6,416,978.88
  5. Step 5: Solve for x
    x = 6,416,978.88/3,992.92
  6. Step 6: Final answer
    x = 1,607.09

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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.