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Finding the Fourth Proportional to 18.79, 28.19 and 11.57

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Solution

The fourth proportional to 18.79, 28.19 and 11.57 is: 17.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.79 : 28.19 = 11.57 : x
  2. Step 2: Convert to fraction form
    18.79/28.19 = 11.57/x
  3. Step 3: Cross multiply
    18.79x = 28.19 × 11.57
  4. Step 4: Simplify right side
    18.79x = 326.05
  5. Step 5: Solve for x
    x = 326.05/18.79
  6. Step 6: Final answer
    x = 17.35

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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.