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Finding the Fourth Proportional to 13.58, 18.86 and 13.36

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Solution

The fourth proportional to 13.58, 18.86 and 13.36 is: 18.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.58 : 18.86 = 13.36 : x
  2. Step 2: Convert to fraction form
    13.58/18.86 = 13.36/x
  3. Step 3: Cross multiply
    13.58x = 18.86 × 13.36
  4. Step 4: Simplify right side
    13.58x = 251.97
  5. Step 5: Solve for x
    x = 251.97/13.58
  6. Step 6: Final answer
    x = 18.55

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.