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Finding the Fourth Proportional to 15.05, 20.79 and 9.88

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Solution

The fourth proportional to 15.05, 20.79 and 9.88 is: 13.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.05 : 20.79 = 9.88 : x
  2. Step 2: Convert to fraction form
    15.05/20.79 = 9.88/x
  3. Step 3: Cross multiply
    15.05x = 20.79 × 9.88
  4. Step 4: Simplify right side
    15.05x = 205.37
  5. Step 5: Solve for x
    x = 205.37/15.05
  6. Step 6: Final answer
    x = 13.64

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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.