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Finding the Fourth Proportional to 33.40, 49.80 and 31.98

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Solution

The fourth proportional to 33.40, 49.80 and 31.98 is: 47.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.40 : 49.80 = 31.98 : x
  2. Step 2: Convert to fraction form
    33.40/49.80 = 31.98/x
  3. Step 3: Cross multiply
    33.40x = 49.80 × 31.98
  4. Step 4: Simplify right side
    33.40x = 1,592.44
  5. Step 5: Solve for x
    x = 1,592.44/33.40
  6. Step 6: Final answer
    x = 47.69

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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.