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Finding the Fourth Proportional to 328.12, 492.30 and 111.72

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Solution

The fourth proportional to 328.12, 492.30 and 111.72 is: 167.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.12 : 492.30 = 111.72 : x
  2. Step 2: Convert to fraction form
    328.12/492.30 = 111.72/x
  3. Step 3: Cross multiply
    328.12x = 492.30 × 111.72
  4. Step 4: Simplify right side
    328.12x = 54,999.76
  5. Step 5: Solve for x
    x = 54,999.76/328.12
  6. Step 6: Final answer
    x = 167.62

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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.