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Finding the Fourth Proportional to 445.18, 613.60 and 320.65

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Solution

The fourth proportional to 445.18, 613.60 and 320.65 is: 441.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.18 : 613.60 = 320.65 : x
  2. Step 2: Convert to fraction form
    445.18/613.60 = 320.65/x
  3. Step 3: Cross multiply
    445.18x = 613.60 × 320.65
  4. Step 4: Simplify right side
    445.18x = 196,750.84
  5. Step 5: Solve for x
    x = 196,750.84/445.18
  6. Step 6: Final answer
    x = 441.96

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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.