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Finding the Fourth Proportional to 7.19, 10.80 and 3.99

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Solution

The fourth proportional to 7.19, 10.80 and 3.99 is: 5.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.19 : 10.80 = 3.99 : x
  2. Step 2: Convert to fraction form
    7.19/10.80 = 3.99/x
  3. Step 3: Cross multiply
    7.19x = 10.80 × 3.99
  4. Step 4: Simplify right side
    7.19x = 43.09
  5. Step 5: Solve for x
    x = 43.09/7.19
  6. Step 6: Final answer
    x = 5.99

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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.