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Finding the Fourth Proportional to 19.28, 28.70 and 19.19

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Solution

The fourth proportional to 19.28, 28.70 and 19.19 is: 28.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.28 : 28.70 = 19.19 : x
  2. Step 2: Convert to fraction form
    19.28/28.70 = 19.19/x
  3. Step 3: Cross multiply
    19.28x = 28.70 × 19.19
  4. Step 4: Simplify right side
    19.28x = 550.75
  5. Step 5: Solve for x
    x = 550.75/19.28
  6. Step 6: Final answer
    x = 28.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.