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Finding the Fourth Proportional to 12.61, 18.91 and 11.87

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Solution

The fourth proportional to 12.61, 18.91 and 11.87 is: 17.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.61 : 18.91 = 11.87 : x
  2. Step 2: Convert to fraction form
    12.61/18.91 = 11.87/x
  3. Step 3: Cross multiply
    12.61x = 18.91 × 11.87
  4. Step 4: Simplify right side
    12.61x = 224.43
  5. Step 5: Solve for x
    x = 224.43/12.61
  6. Step 6: Final answer
    x = 17.80

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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.