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Finding the Fourth Proportional to 18.58, 25.64 and 13.11

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Solution

The fourth proportional to 18.58, 25.64 and 13.11 is: 18.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.58 : 25.64 = 13.11 : x
  2. Step 2: Convert to fraction form
    18.58/25.64 = 13.11/x
  3. Step 3: Cross multiply
    18.58x = 25.64 × 13.11
  4. Step 4: Simplify right side
    18.58x = 336.14
  5. Step 5: Solve for x
    x = 336.14/18.58
  6. Step 6: Final answer
    x = 18.09

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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.