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Finding the Fourth Proportional to 328.62, 492.90 and 206.46

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Solution

The fourth proportional to 328.62, 492.90 and 206.46 is: 309.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.62 : 492.90 = 206.46 : x
  2. Step 2: Convert to fraction form
    328.62/492.90 = 206.46/x
  3. Step 3: Cross multiply
    328.62x = 492.90 × 206.46
  4. Step 4: Simplify right side
    328.62x = 101,764.13
  5. Step 5: Solve for x
    x = 101,764.13/328.62
  6. Step 6: Final answer
    x = 309.67

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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.