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Finding the Fourth Proportional to 383.89, 529.77 and 218.11

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Solution

The fourth proportional to 383.89, 529.77 and 218.11 is: 300.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.89 : 529.77 = 218.11 : x
  2. Step 2: Convert to fraction form
    383.89/529.77 = 218.11/x
  3. Step 3: Cross multiply
    383.89x = 529.77 × 218.11
  4. Step 4: Simplify right side
    383.89x = 115,548.13
  5. Step 5: Solve for x
    x = 115,548.13/383.89
  6. Step 6: Final answer
    x = 300.99

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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.