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Finding the Fourth Proportional to 33.84, 50.88 and 31.20

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Solution

The fourth proportional to 33.84, 50.88 and 31.20 is: 46.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.84 : 50.88 = 31.20 : x
  2. Step 2: Convert to fraction form
    33.84/50.88 = 31.20/x
  3. Step 3: Cross multiply
    33.84x = 50.88 × 31.20
  4. Step 4: Simplify right side
    33.84x = 1,587.46
  5. Step 5: Solve for x
    x = 1,587.46/33.84
  6. Step 6: Final answer
    x = 46.91

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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.