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Finding the Fourth Proportional to 11.79, 17.78 and 10.85

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Solution

The fourth proportional to 11.79, 17.78 and 10.85 is: 16.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.79 : 17.78 = 10.85 : x
  2. Step 2: Convert to fraction form
    11.79/17.78 = 10.85/x
  3. Step 3: Cross multiply
    11.79x = 17.78 × 10.85
  4. Step 4: Simplify right side
    11.79x = 192.77
  5. Step 5: Solve for x
    x = 192.77/11.79
  6. Step 6: Final answer
    x = 16.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.