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Finding the Fourth Proportional to 328.06, 492.12 and 111.70

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Solution

The fourth proportional to 328.06, 492.12 and 111.70 is: 167.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.06 : 492.12 = 111.70 : x
  2. Step 2: Convert to fraction form
    328.06/492.12 = 111.70/x
  3. Step 3: Cross multiply
    328.06x = 492.12 × 111.70
  4. Step 4: Simplify right side
    328.06x = 54,969.80
  5. Step 5: Solve for x
    x = 54,969.80/328.06
  6. Step 6: Final answer
    x = 167.56

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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.