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Finding the Fourth Proportional to 379.89, 524.21 and 222.55

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Solution

The fourth proportional to 379.89, 524.21 and 222.55 is: 307.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.89 : 524.21 = 222.55 : x
  2. Step 2: Convert to fraction form
    379.89/524.21 = 222.55/x
  3. Step 3: Cross multiply
    379.89x = 524.21 × 222.55
  4. Step 4: Simplify right side
    379.89x = 116,660.51
  5. Step 5: Solve for x
    x = 116,660.51/379.89
  6. Step 6: Final answer
    x = 307.09

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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.