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Finding the Fourth Proportional to 36.51, 54.75 and 21.24

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Solution

The fourth proportional to 36.51, 54.75 and 21.24 is: 31.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.51 : 54.75 = 21.24 : x
  2. Step 2: Convert to fraction form
    36.51/54.75 = 21.24/x
  3. Step 3: Cross multiply
    36.51x = 54.75 × 21.24
  4. Step 4: Simplify right side
    36.51x = 1,162.97
  5. Step 5: Solve for x
    x = 1,162.97/36.51
  6. Step 6: Final answer
    x = 31.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.