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Finding the Fourth Proportional to 325.64, 488.48 and 82.17

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Solution

The fourth proportional to 325.64, 488.48 and 82.17 is: 123.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.64 : 488.48 = 82.17 : x
  2. Step 2: Convert to fraction form
    325.64/488.48 = 82.17/x
  3. Step 3: Cross multiply
    325.64x = 488.48 × 82.17
  4. Step 4: Simplify right side
    325.64x = 40,137.99
  5. Step 5: Solve for x
    x = 40,137.99/325.64
  6. Step 6: Final answer
    x = 123.26

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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.