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Finding the Fourth Proportional to 322.98, 445.37 and 305.67

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Solution

The fourth proportional to 322.98, 445.37 and 305.67 is: 421.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.98 : 445.37 = 305.67 : x
  2. Step 2: Convert to fraction form
    322.98/445.37 = 305.67/x
  3. Step 3: Cross multiply
    322.98x = 445.37 × 305.67
  4. Step 4: Simplify right side
    322.98x = 136,134.72
  5. Step 5: Solve for x
    x = 136,134.72/322.98
  6. Step 6: Final answer
    x = 421.50

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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.