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Finding the Fourth Proportional to 325.71, 488.17 and 120.21

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Solution

The fourth proportional to 325.71, 488.17 and 120.21 is: 180.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.71 : 488.17 = 120.21 : x
  2. Step 2: Convert to fraction form
    325.71/488.17 = 120.21/x
  3. Step 3: Cross multiply
    325.71x = 488.17 × 120.21
  4. Step 4: Simplify right side
    325.71x = 58,682.92
  5. Step 5: Solve for x
    x = 58,682.92/325.71
  6. Step 6: Final answer
    x = 180.17

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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.