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Finding the Fourth Proportional to 320.84, 442.64 and 196.46

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Solution

The fourth proportional to 320.84, 442.64 and 196.46 is: 271.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.84 : 442.64 = 196.46 : x
  2. Step 2: Convert to fraction form
    320.84/442.64 = 196.46/x
  3. Step 3: Cross multiply
    320.84x = 442.64 × 196.46
  4. Step 4: Simplify right side
    320.84x = 86,961.05
  5. Step 5: Solve for x
    x = 86,961.05/320.84
  6. Step 6: Final answer
    x = 271.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.