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Finding the Fourth Proportional to 7.99, 12.02 and 5.75

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Solution

The fourth proportional to 7.99, 12.02 and 5.75 is: 8.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.99 : 12.02 = 5.75 : x
  2. Step 2: Convert to fraction form
    7.99/12.02 = 5.75/x
  3. Step 3: Cross multiply
    7.99x = 12.02 × 5.75
  4. Step 4: Simplify right side
    7.99x = 69.12
  5. Step 5: Solve for x
    x = 69.12/7.99
  6. Step 6: Final answer
    x = 8.65

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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.