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Finding the Fourth Proportional to 8.51, 12.74 and 5.49

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Solution

The fourth proportional to 8.51, 12.74 and 5.49 is: 8.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.51 : 12.74 = 5.49 : x
  2. Step 2: Convert to fraction form
    8.51/12.74 = 5.49/x
  3. Step 3: Cross multiply
    8.51x = 12.74 × 5.49
  4. Step 4: Simplify right side
    8.51x = 69.92
  5. Step 5: Solve for x
    x = 69.92/8.51
  6. Step 6: Final answer
    x = 8.22

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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.