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Finding the Fourth Proportional to 21.37, 29.49 and 12.16

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Solution

The fourth proportional to 21.37, 29.49 and 12.16 is: 16.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.37 : 29.49 = 12.16 : x
  2. Step 2: Convert to fraction form
    21.37/29.49 = 12.16/x
  3. Step 3: Cross multiply
    21.37x = 29.49 × 12.16
  4. Step 4: Simplify right side
    21.37x = 358.60
  5. Step 5: Solve for x
    x = 358.60/21.37
  6. Step 6: Final answer
    x = 16.78

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.