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Finding the Fourth Proportional to 13.56, 18.73 and 9.91

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Solution

The fourth proportional to 13.56, 18.73 and 9.91 is: 13.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.56 : 18.73 = 9.91 : x
  2. Step 2: Convert to fraction form
    13.56/18.73 = 9.91/x
  3. Step 3: Cross multiply
    13.56x = 18.73 × 9.91
  4. Step 4: Simplify right side
    13.56x = 185.61
  5. Step 5: Solve for x
    x = 185.61/13.56
  6. Step 6: Final answer
    x = 13.69

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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.