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Finding the Fourth Proportional to 394.74, 543.24 and 311.58

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Solution

The fourth proportional to 394.74, 543.24 and 311.58 is: 428.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.74 : 543.24 = 311.58 : x
  2. Step 2: Convert to fraction form
    394.74/543.24 = 311.58/x
  3. Step 3: Cross multiply
    394.74x = 543.24 × 311.58
  4. Step 4: Simplify right side
    394.74x = 169,262.72
  5. Step 5: Solve for x
    x = 169,262.72/394.74
  6. Step 6: Final answer
    x = 428.80

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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.