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Finding the Fourth Proportional to 11.90, 16.40 and 8.66

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Solution

The fourth proportional to 11.90, 16.40 and 8.66 is: 11.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.90 : 16.40 = 8.66 : x
  2. Step 2: Convert to fraction form
    11.90/16.40 = 8.66/x
  3. Step 3: Cross multiply
    11.90x = 16.40 × 8.66
  4. Step 4: Simplify right side
    11.90x = 142.02
  5. Step 5: Solve for x
    x = 142.02/11.90
  6. Step 6: Final answer
    x = 11.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.