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Finding the Fourth Proportional to 328.32, 492.48 and 84.86

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Solution

The fourth proportional to 328.32, 492.48 and 84.86 is: 127.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.32 : 492.48 = 84.86 : x
  2. Step 2: Convert to fraction form
    328.32/492.48 = 84.86/x
  3. Step 3: Cross multiply
    328.32x = 492.48 × 84.86
  4. Step 4: Simplify right side
    328.32x = 41,791.85
  5. Step 5: Solve for x
    x = 41,791.85/328.32
  6. Step 6: Final answer
    x = 127.29

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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.