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Finding the Fourth Proportional to 383.88, 574.86 and 221.07

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Solution

The fourth proportional to 383.88, 574.86 and 221.07 is: 331.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.88 : 574.86 = 221.07 : x
  2. Step 2: Convert to fraction form
    383.88/574.86 = 221.07/x
  3. Step 3: Cross multiply
    383.88x = 574.86 × 221.07
  4. Step 4: Simplify right side
    383.88x = 127,084.30
  5. Step 5: Solve for x
    x = 127,084.30/383.88
  6. Step 6: Final answer
    x = 331.05

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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.