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Finding the Fourth Proportional to 328.37, 492.40 and 111.89

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Solution

The fourth proportional to 328.37, 492.40 and 111.89 is: 167.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.37 : 492.40 = 111.89 : x
  2. Step 2: Convert to fraction form
    328.37/492.40 = 111.89/x
  3. Step 3: Cross multiply
    328.37x = 492.40 × 111.89
  4. Step 4: Simplify right side
    328.37x = 55,091.61
  5. Step 5: Solve for x
    x = 55,091.61/328.37
  6. Step 6: Final answer
    x = 167.78

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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.