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Finding the Fourth Proportional to 394.36, 543.99 and 320.74

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Solution

The fourth proportional to 394.36, 543.99 and 320.74 is: 442.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.36 : 543.99 = 320.74 : x
  2. Step 2: Convert to fraction form
    394.36/543.99 = 320.74/x
  3. Step 3: Cross multiply
    394.36x = 543.99 × 320.74
  4. Step 4: Simplify right side
    394.36x = 174,479.35
  5. Step 5: Solve for x
    x = 174,479.35/394.36
  6. Step 6: Final answer
    x = 442.44

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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.