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Finding the Fourth Proportional to 11.36, 15.69 and 7.91

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Solution

The fourth proportional to 11.36, 15.69 and 7.91 is: 10.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.36 : 15.69 = 7.91 : x
  2. Step 2: Convert to fraction form
    11.36/15.69 = 7.91/x
  3. Step 3: Cross multiply
    11.36x = 15.69 × 7.91
  4. Step 4: Simplify right side
    11.36x = 124.15
  5. Step 5: Solve for x
    x = 124.15/11.36
  6. Step 6: Final answer
    x = 10.93

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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.