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Finding the Fourth Proportional to 11.96, 17.90 and 8.40

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Solution

The fourth proportional to 11.96, 17.90 and 8.40 is: 12.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.96 : 17.90 = 8.40 : x
  2. Step 2: Convert to fraction form
    11.96/17.90 = 8.40/x
  3. Step 3: Cross multiply
    11.96x = 17.90 × 8.40
  4. Step 4: Simplify right side
    11.96x = 150.36
  5. Step 5: Solve for x
    x = 150.36/11.96
  6. Step 6: Final answer
    x = 12.57

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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.