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Finding the Fourth Proportional to 13.19, 18.21 and 7.74

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Solution

The fourth proportional to 13.19, 18.21 and 7.74 is: 10.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.19 : 18.21 = 7.74 : x
  2. Step 2: Convert to fraction form
    13.19/18.21 = 7.74/x
  3. Step 3: Cross multiply
    13.19x = 18.21 × 7.74
  4. Step 4: Simplify right side
    13.19x = 140.95
  5. Step 5: Solve for x
    x = 140.95/13.19
  6. Step 6: Final answer
    x = 10.69

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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.