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Finding the Fourth Proportional to 11.90, 17.86 and 11.72

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Solution

The fourth proportional to 11.90, 17.86 and 11.72 is: 17.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.90 : 17.86 = 11.72 : x
  2. Step 2: Convert to fraction form
    11.90/17.86 = 11.72/x
  3. Step 3: Cross multiply
    11.90x = 17.86 × 11.72
  4. Step 4: Simplify right side
    11.90x = 209.32
  5. Step 5: Solve for x
    x = 209.32/11.90
  6. Step 6: Final answer
    x = 17.59

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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.