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Finding the Fourth Proportional to 328.90, 492.90 and 166.70

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Solution

The fourth proportional to 328.90, 492.90 and 166.70 is: 249.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.90 : 492.90 = 166.70 : x
  2. Step 2: Convert to fraction form
    328.90/492.90 = 166.70/x
  3. Step 3: Cross multiply
    328.90x = 492.90 × 166.70
  4. Step 4: Simplify right side
    328.90x = 82,166.43
  5. Step 5: Solve for x
    x = 82,166.43/328.90
  6. Step 6: Final answer
    x = 249.82

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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.