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Finding the Fourth Proportional to 13.65, 18.84 and 8.80

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Solution

The fourth proportional to 13.65, 18.84 and 8.80 is: 12.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.65 : 18.84 = 8.80 : x
  2. Step 2: Convert to fraction form
    13.65/18.84 = 8.80/x
  3. Step 3: Cross multiply
    13.65x = 18.84 × 8.80
  4. Step 4: Simplify right side
    13.65x = 165.65
  5. Step 5: Solve for x
    x = 165.65/13.65
  6. Step 6: Final answer
    x = 12.14

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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.