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Finding the Fourth Proportional to 6.65, 9.99 and 5.81

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Solution

The fourth proportional to 6.65, 9.99 and 5.81 is: 8.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.65 : 9.99 = 5.81 : x
  2. Step 2: Convert to fraction form
    6.65/9.99 = 5.81/x
  3. Step 3: Cross multiply
    6.65x = 9.99 × 5.81
  4. Step 4: Simplify right side
    6.65x = 58.05
  5. Step 5: Solve for x
    x = 58.05/6.65
  6. Step 6: Final answer
    x = 8.72

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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.