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Finding the Fourth Proportional to 19.21, 26.39 and 15.75

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Solution

The fourth proportional to 19.21, 26.39 and 15.75 is: 21.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.21 : 26.39 = 15.75 : x
  2. Step 2: Convert to fraction form
    19.21/26.39 = 15.75/x
  3. Step 3: Cross multiply
    19.21x = 26.39 × 15.75
  4. Step 4: Simplify right side
    19.21x = 415.64
  5. Step 5: Solve for x
    x = 415.64/19.21
  6. Step 6: Final answer
    x = 21.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.