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Finding the Fourth Proportional to 33.19, 45.76 and 20.89

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Solution

The fourth proportional to 33.19, 45.76 and 20.89 is: 28.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.19 : 45.76 = 20.89 : x
  2. Step 2: Convert to fraction form
    33.19/45.76 = 20.89/x
  3. Step 3: Cross multiply
    33.19x = 45.76 × 20.89
  4. Step 4: Simplify right side
    33.19x = 955.93
  5. Step 5: Solve for x
    x = 955.93/33.19
  6. Step 6: Final answer
    x = 28.80

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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.