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Finding the Fourth Proportional to 443.18, 663.74 and 427.81

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Solution

The fourth proportional to 443.18, 663.74 and 427.81 is: 640.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.18 : 663.74 = 427.81 : x
  2. Step 2: Convert to fraction form
    443.18/663.74 = 427.81/x
  3. Step 3: Cross multiply
    443.18x = 663.74 × 427.81
  4. Step 4: Simplify right side
    443.18x = 283,951.29
  5. Step 5: Solve for x
    x = 283,951.29/443.18
  6. Step 6: Final answer
    x = 640.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.