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Finding the Fourth Proportional to 12.64, 17.40 and 11.19

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Solution

The fourth proportional to 12.64, 17.40 and 11.19 is: 15.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.64 : 17.40 = 11.19 : x
  2. Step 2: Convert to fraction form
    12.64/17.40 = 11.19/x
  3. Step 3: Cross multiply
    12.64x = 17.40 × 11.19
  4. Step 4: Simplify right side
    12.64x = 194.75
  5. Step 5: Solve for x
    x = 194.75/12.64
  6. Step 6: Final answer
    x = 15.41

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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.