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Finding the Fourth Proportional to 328.38, 491.54 and 245.63

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Solution

The fourth proportional to 328.38, 491.54 and 245.63 is: 367.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.38 : 491.54 = 245.63 : x
  2. Step 2: Convert to fraction form
    328.38/491.54 = 245.63/x
  3. Step 3: Cross multiply
    328.38x = 491.54 × 245.63
  4. Step 4: Simplify right side
    328.38x = 120,735.13
  5. Step 5: Solve for x
    x = 120,735.13/328.38
  6. Step 6: Final answer
    x = 367.67

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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.