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Finding the Fourth Proportional to 383.55, 529.34 and 217.78

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Solution

The fourth proportional to 383.55, 529.34 and 217.78 is: 300.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.55 : 529.34 = 217.78 : x
  2. Step 2: Convert to fraction form
    383.55/529.34 = 217.78/x
  3. Step 3: Cross multiply
    383.55x = 529.34 × 217.78
  4. Step 4: Simplify right side
    383.55x = 115,279.67
  5. Step 5: Solve for x
    x = 115,279.67/383.55
  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.