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Finding the Fourth Proportional to 7.12, 9.79 and 6.92

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Solution

The fourth proportional to 7.12, 9.79 and 6.92 is: 9.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.12 : 9.79 = 6.92 : x
  2. Step 2: Convert to fraction form
    7.12/9.79 = 6.92/x
  3. Step 3: Cross multiply
    7.12x = 9.79 × 6.92
  4. Step 4: Simplify right side
    7.12x = 67.72
  5. Step 5: Solve for x
    x = 67.72/7.12
  6. Step 6: Final answer
    x = 9.51

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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.