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Finding the Fourth Proportional to 300.78, 450.75 and 209.34

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Solution

The fourth proportional to 300.78, 450.75 and 209.34 is: 313.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.78 : 450.75 = 209.34 : x
  2. Step 2: Convert to fraction form
    300.78/450.75 = 209.34/x
  3. Step 3: Cross multiply
    300.78x = 450.75 × 209.34
  4. Step 4: Simplify right side
    300.78x = 94,360.01
  5. Step 5: Solve for x
    x = 94,360.01/300.78
  6. Step 6: Final answer
    x = 313.72

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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.