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Finding the Fourth Proportional to 11.61, 17.42 and 3.05

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Solution

The fourth proportional to 11.61, 17.42 and 3.05 is: 4.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.61 : 17.42 = 3.05 : x
  2. Step 2: Convert to fraction form
    11.61/17.42 = 3.05/x
  3. Step 3: Cross multiply
    11.61x = 17.42 × 3.05
  4. Step 4: Simplify right side
    11.61x = 53.13
  5. Step 5: Solve for x
    x = 53.13/11.61
  6. Step 6: Final answer
    x = 4.58

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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.