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Finding the Fourth Proportional to 383.79, 575.13 and 221.25

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Solution

The fourth proportional to 383.79, 575.13 and 221.25 is: 331.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.79 : 575.13 = 221.25 : x
  2. Step 2: Convert to fraction form
    383.79/575.13 = 221.25/x
  3. Step 3: Cross multiply
    383.79x = 575.13 × 221.25
  4. Step 4: Simplify right side
    383.79x = 127,247.51
  5. Step 5: Solve for x
    x = 127,247.51/383.79
  6. Step 6: Final answer
    x = 331.56

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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.