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Finding the Fourth Proportional to 394.60, 543.48 and 328.98

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Solution

The fourth proportional to 394.60, 543.48 and 328.98 is: 453.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.60 : 543.48 = 328.98 : x
  2. Step 2: Convert to fraction form
    394.60/543.48 = 328.98/x
  3. Step 3: Cross multiply
    394.60x = 543.48 × 328.98
  4. Step 4: Simplify right side
    394.60x = 178,794.05
  5. Step 5: Solve for x
    x = 178,794.05/394.60
  6. Step 6: Final answer
    x = 453.10

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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.