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Finding the Fourth Proportional to 11.79, 16.38 and 11.57

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Solution

The fourth proportional to 11.79, 16.38 and 11.57 is: 16.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.79 : 16.38 = 11.57 : x
  2. Step 2: Convert to fraction form
    11.79/16.38 = 11.57/x
  3. Step 3: Cross multiply
    11.79x = 16.38 × 11.57
  4. Step 4: Simplify right side
    11.79x = 189.43
  5. Step 5: Solve for x
    x = 189.43/11.79
  6. Step 6: Final answer
    x = 16.07

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.