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Finding the Fourth Proportional to 11.39, 15.69 and 8.31

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Solution

The fourth proportional to 11.39, 15.69 and 8.31 is: 11.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.39 : 15.69 = 8.31 : x
  2. Step 2: Convert to fraction form
    11.39/15.69 = 8.31/x
  3. Step 3: Cross multiply
    11.39x = 15.69 × 8.31
  4. Step 4: Simplify right side
    11.39x = 130.38
  5. Step 5: Solve for x
    x = 130.38/11.39
  6. Step 6: Final answer
    x = 11.45

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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.