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Finding the Fourth Proportional to 321.06, 442.95 and 190.05

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Solution

The fourth proportional to 321.06, 442.95 and 190.05 is: 262.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.06 : 442.95 = 190.05 : x
  2. Step 2: Convert to fraction form
    321.06/442.95 = 190.05/x
  3. Step 3: Cross multiply
    321.06x = 442.95 × 190.05
  4. Step 4: Simplify right side
    321.06x = 84,182.65
  5. Step 5: Solve for x
    x = 84,182.65/321.06
  6. Step 6: Final answer
    x = 262.20

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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.