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Finding the Fourth Proportional to 445.05, 613.89 and 320.99

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Solution

The fourth proportional to 445.05, 613.89 and 320.99 is: 442.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.05 : 613.89 = 320.99 : x
  2. Step 2: Convert to fraction form
    445.05/613.89 = 320.99/x
  3. Step 3: Cross multiply
    445.05x = 613.89 × 320.99
  4. Step 4: Simplify right side
    445.05x = 197,049.48
  5. Step 5: Solve for x
    x = 197,049.48/445.05
  6. Step 6: Final answer
    x = 442.76

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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.