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Finding the Fourth Proportional to 17.05, 23.65 and 15.43

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Solution

The fourth proportional to 17.05, 23.65 and 15.43 is: 21.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.05 : 23.65 = 15.43 : x
  2. Step 2: Convert to fraction form
    17.05/23.65 = 15.43/x
  3. Step 3: Cross multiply
    17.05x = 23.65 × 15.43
  4. Step 4: Simplify right side
    17.05x = 364.92
  5. Step 5: Solve for x
    x = 364.92/17.05
  6. Step 6: Final answer
    x = 21.40

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.