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Finding the Fourth Proportional to 383.61, 529.37 and 217.81

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Solution

The fourth proportional to 383.61, 529.37 and 217.81 is: 300.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.61 : 529.37 = 217.81 : x
  2. Step 2: Convert to fraction form
    383.61/529.37 = 217.81/x
  3. Step 3: Cross multiply
    383.61x = 529.37 × 217.81
  4. Step 4: Simplify right side
    383.61x = 115,299.49
  5. Step 5: Solve for x
    x = 115,299.49/383.61
  6. Step 6: Final answer
    x = 300.56

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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.