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Finding the Fourth Proportional to 325.32, 487.42 and 221.03

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Solution

The fourth proportional to 325.32, 487.42 and 221.03 is: 331.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.32 : 487.42 = 221.03 : x
  2. Step 2: Convert to fraction form
    325.32/487.42 = 221.03/x
  3. Step 3: Cross multiply
    325.32x = 487.42 × 221.03
  4. Step 4: Simplify right side
    325.32x = 107,733.28
  5. Step 5: Solve for x
    x = 107,733.28/325.32
  6. Step 6: Final answer
    x = 331.16

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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.