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Finding the Fourth Proportional to 383.06, 528.62 and 217.28

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Solution

The fourth proportional to 383.06, 528.62 and 217.28 is: 299.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.06 : 528.62 = 217.28 : x
  2. Step 2: Convert to fraction form
    383.06/528.62 = 217.28/x
  3. Step 3: Cross multiply
    383.06x = 528.62 × 217.28
  4. Step 4: Simplify right side
    383.06x = 114,858.55
  5. Step 5: Solve for x
    x = 114,858.55/383.06
  6. Step 6: Final answer
    x = 299.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.