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Finding the Fourth Proportional to 381.21, 526.19 and 223.89

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Solution

The fourth proportional to 381.21, 526.19 and 223.89 is: 309.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.21 : 526.19 = 223.89 : x
  2. Step 2: Convert to fraction form
    381.21/526.19 = 223.89/x
  3. Step 3: Cross multiply
    381.21x = 526.19 × 223.89
  4. Step 4: Simplify right side
    381.21x = 117,807.56
  5. Step 5: Solve for x
    x = 117,807.56/381.21
  6. Step 6: Final answer
    x = 309.04

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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.