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Finding the Fourth Proportional to 447.42, 617.32 and 305.67

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Solution

The fourth proportional to 447.42, 617.32 and 305.67 is: 421.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.42 : 617.32 = 305.67 : x
  2. Step 2: Convert to fraction form
    447.42/617.32 = 305.67/x
  3. Step 3: Cross multiply
    447.42x = 617.32 × 305.67
  4. Step 4: Simplify right side
    447.42x = 188,696.20
  5. Step 5: Solve for x
    x = 188,696.20/447.42
  6. Step 6: Final answer
    x = 421.74

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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.