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Finding the Fourth Proportional to 18.94, 26.14 and 12.39

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Solution

The fourth proportional to 18.94, 26.14 and 12.39 is: 17.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.94 : 26.14 = 12.39 : x
  2. Step 2: Convert to fraction form
    18.94/26.14 = 12.39/x
  3. Step 3: Cross multiply
    18.94x = 26.14 × 12.39
  4. Step 4: Simplify right side
    18.94x = 323.87
  5. Step 5: Solve for x
    x = 323.87/18.94
  6. Step 6: Final answer
    x = 17.10

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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.