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Finding the Fourth Proportional to 325.60, 487.32 and 321.28

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Solution

The fourth proportional to 325.60, 487.32 and 321.28 is: 480.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.60 : 487.32 = 321.28 : x
  2. Step 2: Convert to fraction form
    325.60/487.32 = 321.28/x
  3. Step 3: Cross multiply
    325.60x = 487.32 × 321.28
  4. Step 4: Simplify right side
    325.60x = 156,566.17
  5. Step 5: Solve for x
    x = 156,566.17/325.60
  6. Step 6: Final answer
    x = 480.85

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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.