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Finding the Fourth Proportional to 19, 26.21 and 12.09

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Solution

The fourth proportional to 19, 26.21 and 12.09 is: 16.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    19 : 26.21 = 12.09 : x
  2. Step 2: Convert to fraction form
    19/26.21 = 12.09/x
  3. Step 3: Cross multiply
    19x = 26.21 × 12.09
  4. Step 4: Simplify right side
    19x = 316.88
  5. Step 5: Solve for x
    x = 316.88/19
  6. Step 6: Final answer
    x = 16.68

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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.