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Finding the Fourth Proportional to 300.72, 450.28 and 208.47

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Solution

The fourth proportional to 300.72, 450.28 and 208.47 is: 312.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.72 : 450.28 = 208.47 : x
  2. Step 2: Convert to fraction form
    300.72/450.28 = 208.47/x
  3. Step 3: Cross multiply
    300.72x = 450.28 × 208.47
  4. Step 4: Simplify right side
    300.72x = 93,869.87
  5. Step 5: Solve for x
    x = 93,869.87/300.72
  6. Step 6: Final answer
    x = 312.15

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.