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Finding the Fourth Proportional to 323.91, 485.52 and 128.86

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Solution

The fourth proportional to 323.91, 485.52 and 128.86 is: 193.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.91 : 485.52 = 128.86 : x
  2. Step 2: Convert to fraction form
    323.91/485.52 = 128.86/x
  3. Step 3: Cross multiply
    323.91x = 485.52 × 128.86
  4. Step 4: Simplify right side
    323.91x = 62,564.11
  5. Step 5: Solve for x
    x = 62,564.11/323.91
  6. Step 6: Final answer
    x = 193.15

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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.