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Finding the Fourth Proportional to 19.49, 26.90 and 13.36

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Solution

The fourth proportional to 19.49, 26.90 and 13.36 is: 18.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.49 : 26.90 = 13.36 : x
  2. Step 2: Convert to fraction form
    19.49/26.90 = 13.36/x
  3. Step 3: Cross multiply
    19.49x = 26.90 × 13.36
  4. Step 4: Simplify right side
    19.49x = 359.35
  5. Step 5: Solve for x
    x = 359.35/19.49
  6. Step 6: Final answer
    x = 18.44

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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.