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Finding the Fourth Proportional to 11.39, 15.74 and 9.21

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Solution

The fourth proportional to 11.39, 15.74 and 9.21 is: 12.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.39 : 15.74 = 9.21 : x
  2. Step 2: Convert to fraction form
    11.39/15.74 = 9.21/x
  3. Step 3: Cross multiply
    11.39x = 15.74 × 9.21
  4. Step 4: Simplify right side
    11.39x = 144.92
  5. Step 5: Solve for x
    x = 144.92/11.39
  6. Step 6: Final answer
    x = 12.73

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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.