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Finding the Fourth Proportional to 320.43, 442.13 and 196.05

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Solution

The fourth proportional to 320.43, 442.13 and 196.05 is: 270.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.43 : 442.13 = 196.05 : x
  2. Step 2: Convert to fraction form
    320.43/442.13 = 196.05/x
  3. Step 3: Cross multiply
    320.43x = 442.13 × 196.05
  4. Step 4: Simplify right side
    320.43x = 86,678.61
  5. Step 5: Solve for x
    x = 86,678.61/320.43
  6. Step 6: Final answer
    x = 270.51

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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.