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Finding the Fourth Proportional to 6.65, 9.98 and 2.15

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Solution

The fourth proportional to 6.65, 9.98 and 2.15 is: 3.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.65 : 9.98 = 2.15 : x
  2. Step 2: Convert to fraction form
    6.65/9.98 = 2.15/x
  3. Step 3: Cross multiply
    6.65x = 9.98 × 2.15
  4. Step 4: Simplify right side
    6.65x = 21.41
  5. Step 5: Solve for x
    x = 21.41/6.65
  6. Step 6: Final answer
    x = 3.22

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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.