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Finding the Fourth Proportional to 13.93, 19.21 and 11.47

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Solution

The fourth proportional to 13.93, 19.21 and 11.47 is: 15.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.93 : 19.21 = 11.47 : x
  2. Step 2: Convert to fraction form
    13.93/19.21 = 11.47/x
  3. Step 3: Cross multiply
    13.93x = 19.21 × 11.47
  4. Step 4: Simplify right side
    13.93x = 220.34
  5. Step 5: Solve for x
    x = 220.34/13.93
  6. Step 6: Final answer
    x = 15.82

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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.