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Finding the Fourth Proportional to 56, 84 and 33.20

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Solution

The fourth proportional to 56, 84 and 33.20 is: 49.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    56 : 84 = 33.20 : x
  2. Step 2: Convert to fraction form
    56/84 = 33.20/x
  3. Step 3: Cross multiply
    56x = 84 × 33.20
  4. Step 4: Simplify right side
    56x = 2,788.80
  5. Step 5: Solve for x
    x = 2,788.80/56
  6. Step 6: Final answer
    x = 49.80

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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.