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Finding the Fourth Proportional to 13.16, 19.64 and 12.68

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Solution

The fourth proportional to 13.16, 19.64 and 12.68 is: 18.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.16 : 19.64 = 12.68 : x
  2. Step 2: Convert to fraction form
    13.16/19.64 = 12.68/x
  3. Step 3: Cross multiply
    13.16x = 19.64 × 12.68
  4. Step 4: Simplify right side
    13.16x = 249.04
  5. Step 5: Solve for x
    x = 249.04/13.16
  6. Step 6: Final answer
    x = 18.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.