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Finding the Fourth Proportional to 328.10, 492.10 and 111.67

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Solution

The fourth proportional to 328.10, 492.10 and 111.67 is: 167.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.10 : 492.10 = 111.67 : x
  2. Step 2: Convert to fraction form
    328.10/492.10 = 111.67/x
  3. Step 3: Cross multiply
    328.10x = 492.10 × 111.67
  4. Step 4: Simplify right side
    328.10x = 54,951.30
  5. Step 5: Solve for x
    x = 54,951.30/328.10
  6. Step 6: Final answer
    x = 167.49

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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.