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Finding the Fourth Proportional to 328.78, 453.51 and 195.91

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Solution

The fourth proportional to 328.78, 453.51 and 195.91 is: 270.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.78 : 453.51 = 195.91 : x
  2. Step 2: Convert to fraction form
    328.78/453.51 = 195.91/x
  3. Step 3: Cross multiply
    328.78x = 453.51 × 195.91
  4. Step 4: Simplify right side
    328.78x = 88,847.14
  5. Step 5: Solve for x
    x = 88,847.14/328.78
  6. Step 6: Final answer
    x = 270.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.