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Finding the Fourth Proportional to 7.09, 10.61 and 5.81

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Solution

The fourth proportional to 7.09, 10.61 and 5.81 is: 8.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.09 : 10.61 = 5.81 : x
  2. Step 2: Convert to fraction form
    7.09/10.61 = 5.81/x
  3. Step 3: Cross multiply
    7.09x = 10.61 × 5.81
  4. Step 4: Simplify right side
    7.09x = 61.64
  5. Step 5: Solve for x
    x = 61.64/7.09
  6. Step 6: Final answer
    x = 8.69

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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.