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Finding the Fourth Proportional to 325.92, 485.89 and 289.20

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Solution

The fourth proportional to 325.92, 485.89 and 289.20 is: 431.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.92 : 485.89 = 289.20 : x
  2. Step 2: Convert to fraction form
    325.92/485.89 = 289.20/x
  3. Step 3: Cross multiply
    325.92x = 485.89 × 289.20
  4. Step 4: Simplify right side
    325.92x = 140,519.39
  5. Step 5: Solve for x
    x = 140,519.39/325.92
  6. Step 6: Final answer
    x = 431.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.