Home / 11,992-17,977.20-6,440.80

Finding the Fourth Proportional to 11,992, 17,977.20 and 6,440.80

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Solution

The fourth proportional to 11,992, 17,977.20 and 6,440.80 is: 9,655.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,992 : 17,977.20 = 6,440.80 : x
  2. Step 2: Convert to fraction form
    11,992/17,977.20 = 6,440.80/x
  3. Step 3: Cross multiply
    11,992x = 17,977.20 × 6,440.80
  4. Step 4: Simplify right side
    11,992x = 115,787,549.76
  5. Step 5: Solve for x
    x = 115,787,549.76/11,992
  6. Step 6: Final answer
    x = 9,655.40

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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.