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Finding the Fourth Proportional to 328.80, 492.90 and 191.67

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Solution

The fourth proportional to 328.80, 492.90 and 191.67 is: 287.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.80 : 492.90 = 191.67 : x
  2. Step 2: Convert to fraction form
    328.80/492.90 = 191.67/x
  3. Step 3: Cross multiply
    328.80x = 492.90 × 191.67
  4. Step 4: Simplify right side
    328.80x = 94,474.14
  5. Step 5: Solve for x
    x = 94,474.14/328.80
  6. Step 6: Final answer
    x = 287.33

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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.