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Finding the Fourth Proportional to 320.78, 442.62 and 196.48

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Solution

The fourth proportional to 320.78, 442.62 and 196.48 is: 271.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.78 : 442.62 = 196.48 : x
  2. Step 2: Convert to fraction form
    320.78/442.62 = 196.48/x
  3. Step 3: Cross multiply
    320.78x = 442.62 × 196.48
  4. Step 4: Simplify right side
    320.78x = 86,965.98
  5. Step 5: Solve for x
    x = 86,965.98/320.78
  6. Step 6: Final answer
    x = 271.11

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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.