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Finding the Fourth Proportional to 663.81, 993.42 and 403.67

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Solution

The fourth proportional to 663.81, 993.42 and 403.67 is: 604.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.81 : 993.42 = 403.67 : x
  2. Step 2: Convert to fraction form
    663.81/993.42 = 403.67/x
  3. Step 3: Cross multiply
    663.81x = 993.42 × 403.67
  4. Step 4: Simplify right side
    663.81x = 401,008.88
  5. Step 5: Solve for x
    x = 401,008.88/663.81
  6. Step 6: Final answer
    x = 604.10

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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.