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Finding the Fourth Proportional to 11.76, 16.20 and 11.31

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Solution

The fourth proportional to 11.76, 16.20 and 11.31 is: 15.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.76 : 16.20 = 11.31 : x
  2. Step 2: Convert to fraction form
    11.76/16.20 = 11.31/x
  3. Step 3: Cross multiply
    11.76x = 16.20 × 11.31
  4. Step 4: Simplify right side
    11.76x = 183.22
  5. Step 5: Solve for x
    x = 183.22/11.76
  6. Step 6: Final answer
    x = 15.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.