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Finding the Fourth Proportional to 11.95, 17.79 and 11.89

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Solution

The fourth proportional to 11.95, 17.79 and 11.89 is: 17.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.95 : 17.79 = 11.89 : x
  2. Step 2: Convert to fraction form
    11.95/17.79 = 11.89/x
  3. Step 3: Cross multiply
    11.95x = 17.79 × 11.89
  4. Step 4: Simplify right side
    11.95x = 211.52
  5. Step 5: Solve for x
    x = 211.52/11.95
  6. Step 6: Final answer
    x = 17.70

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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.