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Finding the Fourth Proportional to 328.96, 493.39 and 85.48

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Solution

The fourth proportional to 328.96, 493.39 and 85.48 is: 128.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.96 : 493.39 = 85.48 : x
  2. Step 2: Convert to fraction form
    328.96/493.39 = 85.48/x
  3. Step 3: Cross multiply
    328.96x = 493.39 × 85.48
  4. Step 4: Simplify right side
    328.96x = 42,174.98
  5. Step 5: Solve for x
    x = 42,174.98/328.96
  6. Step 6: Final answer
    x = 128.21

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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.