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Finding the Fourth Proportional to 321.42, 442.83 and 306.06

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Solution

The fourth proportional to 321.42, 442.83 and 306.06 is: 421.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.42 : 442.83 = 306.06 : x
  2. Step 2: Convert to fraction form
    321.42/442.83 = 306.06/x
  3. Step 3: Cross multiply
    321.42x = 442.83 × 306.06
  4. Step 4: Simplify right side
    321.42x = 135,532.55
  5. Step 5: Solve for x
    x = 135,532.55/321.42
  6. Step 6: Final answer
    x = 421.67

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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.