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Finding the Fourth Proportional to 328.25, 492.08 and 122.72

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Solution

The fourth proportional to 328.25, 492.08 and 122.72 is: 183.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.25 : 492.08 = 122.72 : x
  2. Step 2: Convert to fraction form
    328.25/492.08 = 122.72/x
  3. Step 3: Cross multiply
    328.25x = 492.08 × 122.72
  4. Step 4: Simplify right side
    328.25x = 60,384.98
  5. Step 5: Solve for x
    x = 60,384.98/328.25
  6. Step 6: Final answer
    x = 183.96

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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.