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Finding the Fourth Proportional to 36.61, 54.78 and 21.34

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Solution

The fourth proportional to 36.61, 54.78 and 21.34 is: 31.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.61 : 54.78 = 21.34 : x
  2. Step 2: Convert to fraction form
    36.61/54.78 = 21.34/x
  3. Step 3: Cross multiply
    36.61x = 54.78 × 21.34
  4. Step 4: Simplify right side
    36.61x = 1,169.01
  5. Step 5: Solve for x
    x = 1,169.01/36.61
  6. Step 6: Final answer
    x = 31.93

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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.