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Finding the Fourth Proportional to 19.05, 28.52 and 15.43

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Solution

The fourth proportional to 19.05, 28.52 and 15.43 is: 23.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.05 : 28.52 = 15.43 : x
  2. Step 2: Convert to fraction form
    19.05/28.52 = 15.43/x
  3. Step 3: Cross multiply
    19.05x = 28.52 × 15.43
  4. Step 4: Simplify right side
    19.05x = 440.06
  5. Step 5: Solve for x
    x = 440.06/19.05
  6. Step 6: Final answer
    x = 23.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.