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Finding the Fourth Proportional to 9.18, 13.68 and 8.68

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Solution

The fourth proportional to 9.18, 13.68 and 8.68 is: 12.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.18 : 13.68 = 8.68 : x
  2. Step 2: Convert to fraction form
    9.18/13.68 = 8.68/x
  3. Step 3: Cross multiply
    9.18x = 13.68 × 8.68
  4. Step 4: Simplify right side
    9.18x = 118.67
  5. Step 5: Solve for x
    x = 118.67/9.18
  6. Step 6: Final answer
    x = 12.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.