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Finding the Fourth Proportional to 33.06, 49.20 and 31.80

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Solution

The fourth proportional to 33.06, 49.20 and 31.80 is: 47.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.06 : 49.20 = 31.80 : x
  2. Step 2: Convert to fraction form
    33.06/49.20 = 31.80/x
  3. Step 3: Cross multiply
    33.06x = 49.20 × 31.80
  4. Step 4: Simplify right side
    33.06x = 1,564.56
  5. Step 5: Solve for x
    x = 1,564.56/33.06
  6. Step 6: Final answer
    x = 47.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.