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Finding the Fourth Proportional to 15.24, 20.97 and 12.81

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Solution

The fourth proportional to 15.24, 20.97 and 12.81 is: 17.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.24 : 20.97 = 12.81 : x
  2. Step 2: Convert to fraction form
    15.24/20.97 = 12.81/x
  3. Step 3: Cross multiply
    15.24x = 20.97 × 12.81
  4. Step 4: Simplify right side
    15.24x = 268.63
  5. Step 5: Solve for x
    x = 268.63/15.24
  6. Step 6: Final answer
    x = 17.63

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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.