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Finding the Fourth Proportional to 13, 18 and 11.84

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Solution

The fourth proportional to 13, 18 and 11.84 is: 16.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13 : 18 = 11.84 : x
  2. Step 2: Convert to fraction form
    13/18 = 11.84/x
  3. Step 3: Cross multiply
    13x = 18 × 11.84
  4. Step 4: Simplify right side
    13x = 213.12
  5. Step 5: Solve for x
    x = 213.12/13
  6. Step 6: Final answer
    x = 16.39

Related Problems

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Double scale
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1.5x scale

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.