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Finding the Fourth Proportional to 6.66, 9.98 and 3.99

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Solution

The fourth proportional to 6.66, 9.98 and 3.99 is: 5.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.66 : 9.98 = 3.99 : x
  2. Step 2: Convert to fraction form
    6.66/9.98 = 3.99/x
  3. Step 3: Cross multiply
    6.66x = 9.98 × 3.99
  4. Step 4: Simplify right side
    6.66x = 39.80
  5. Step 5: Solve for x
    x = 39.80/6.66
  6. Step 6: Final answer
    x = 5.98

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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.