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Finding the Fourth Proportional to 13.05, 19.68 and 12.72

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Solution

The fourth proportional to 13.05, 19.68 and 12.72 is: 19.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.05 : 19.68 = 12.72 : x
  2. Step 2: Convert to fraction form
    13.05/19.68 = 12.72/x
  3. Step 3: Cross multiply
    13.05x = 19.68 × 12.72
  4. Step 4: Simplify right side
    13.05x = 250.33
  5. Step 5: Solve for x
    x = 250.33/13.05
  6. Step 6: Final answer
    x = 19.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.