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Finding the Fourth Proportional to 6.66, 9.99 and 2.65

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Solution

The fourth proportional to 6.66, 9.99 and 2.65 is: 3.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.66 : 9.99 = 2.65 : x
  2. Step 2: Convert to fraction form
    6.66/9.99 = 2.65/x
  3. Step 3: Cross multiply
    6.66x = 9.99 × 2.65
  4. Step 4: Simplify right side
    6.66x = 26.45
  5. Step 5: Solve for x
    x = 26.45/6.66
  6. Step 6: Final answer
    x = 3.97

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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.