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Finding the Fourth Proportional to 78.84, 118.28 and 33.20

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Solution

The fourth proportional to 78.84, 118.28 and 33.20 is: 49.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.84 : 118.28 = 33.20 : x
  2. Step 2: Convert to fraction form
    78.84/118.28 = 33.20/x
  3. Step 3: Cross multiply
    78.84x = 118.28 × 33.20
  4. Step 4: Simplify right side
    78.84x = 3,926.90
  5. Step 5: Solve for x
    x = 3,926.90/78.84
  6. Step 6: Final answer
    x = 49.81

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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.