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Finding the Fourth Proportional to 19.39, 26.72 and 18.42

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Solution

The fourth proportional to 19.39, 26.72 and 18.42 is: 25.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.39 : 26.72 = 18.42 : x
  2. Step 2: Convert to fraction form
    19.39/26.72 = 18.42/x
  3. Step 3: Cross multiply
    19.39x = 26.72 × 18.42
  4. Step 4: Simplify right side
    19.39x = 492.18
  5. Step 5: Solve for x
    x = 492.18/19.39
  6. Step 6: Final answer
    x = 25.38

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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.