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Finding the Fourth Proportional to 328.47, 491.72 and 251.73

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Solution

The fourth proportional to 328.47, 491.72 and 251.73 is: 376.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.47 : 491.72 = 251.73 : x
  2. Step 2: Convert to fraction form
    328.47/491.72 = 251.73/x
  3. Step 3: Cross multiply
    328.47x = 491.72 × 251.73
  4. Step 4: Simplify right side
    328.47x = 123,779.42
  5. Step 5: Solve for x
    x = 123,779.42/328.47
  6. Step 6: Final answer
    x = 376.84

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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.