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Finding the Fourth Proportional to 6.91, 10.36 and 3.11

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Solution

The fourth proportional to 6.91, 10.36 and 3.11 is: 4.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.91 : 10.36 = 3.11 : x
  2. Step 2: Convert to fraction form
    6.91/10.36 = 3.11/x
  3. Step 3: Cross multiply
    6.91x = 10.36 × 3.11
  4. Step 4: Simplify right side
    6.91x = 32.17
  5. Step 5: Solve for x
    x = 32.17/6.91
  6. Step 6: Final answer
    x = 4.65

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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.