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Finding the Fourth Proportional to 8.18, 11.28 and 7.74

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Solution

The fourth proportional to 8.18, 11.28 and 7.74 is: 10.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.18 : 11.28 = 7.74 : x
  2. Step 2: Convert to fraction form
    8.18/11.28 = 7.74/x
  3. Step 3: Cross multiply
    8.18x = 11.28 × 7.74
  4. Step 4: Simplify right side
    8.18x = 87.31
  5. Step 5: Solve for x
    x = 87.31/8.18
  6. Step 6: Final answer
    x = 10.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.