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Finding the Fourth Proportional to 13.55, 18.58 and 13.09

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Solution

The fourth proportional to 13.55, 18.58 and 13.09 is: 17.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.55 : 18.58 = 13.09 : x
  2. Step 2: Convert to fraction form
    13.55/18.58 = 13.09/x
  3. Step 3: Cross multiply
    13.55x = 18.58 × 13.09
  4. Step 4: Simplify right side
    13.55x = 243.21
  5. Step 5: Solve for x
    x = 243.21/13.55
  6. Step 6: Final answer
    x = 17.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.