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Finding the Fourth Proportional to 19.66, 27.13 and 11.89

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Solution

The fourth proportional to 19.66, 27.13 and 11.89 is: 16.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.66 : 27.13 = 11.89 : x
  2. Step 2: Convert to fraction form
    19.66/27.13 = 11.89/x
  3. Step 3: Cross multiply
    19.66x = 27.13 × 11.89
  4. Step 4: Simplify right side
    19.66x = 322.67
  5. Step 5: Solve for x
    x = 322.67/19.66
  6. Step 6: Final answer
    x = 16.41

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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.