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Finding the Fourth Proportional to 445.07, 613.91 and 320.54

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Solution

The fourth proportional to 445.07, 613.91 and 320.54 is: 442.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.07 : 613.91 = 320.54 : x
  2. Step 2: Convert to fraction form
    445.07/613.91 = 320.54/x
  3. Step 3: Cross multiply
    445.07x = 613.91 × 320.54
  4. Step 4: Simplify right side
    445.07x = 196,778.04
  5. Step 5: Solve for x
    x = 196,778.04/445.07
  6. Step 6: Final answer
    x = 442.13

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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.