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Finding the Fourth Proportional to 328.86, 493.26 and 85.38

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Solution

The fourth proportional to 328.86, 493.26 and 85.38 is: 128.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.86 : 493.26 = 85.38 : x
  2. Step 2: Convert to fraction form
    328.86/493.26 = 85.38/x
  3. Step 3: Cross multiply
    328.86x = 493.26 × 85.38
  4. Step 4: Simplify right side
    328.86x = 42,114.54
  5. Step 5: Solve for x
    x = 42,114.54/328.86
  6. Step 6: Final answer
    x = 128.06

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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.