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Finding the Fourth Proportional to 9.28, 12.72 and 8.79

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Solution

The fourth proportional to 9.28, 12.72 and 8.79 is: 12.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.28 : 12.72 = 8.79 : x
  2. Step 2: Convert to fraction form
    9.28/12.72 = 8.79/x
  3. Step 3: Cross multiply
    9.28x = 12.72 × 8.79
  4. Step 4: Simplify right side
    9.28x = 111.79
  5. Step 5: Solve for x
    x = 111.79/9.28
  6. Step 6: Final answer
    x = 12.05

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.