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Finding the Fourth Proportional to 378.40, 521.88 and 223

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Solution

The fourth proportional to 378.40, 521.88 and 223 is: 307.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.40 : 521.88 = 223 : x
  2. Step 2: Convert to fraction form
    378.40/521.88 = 223/x
  3. Step 3: Cross multiply
    378.40x = 521.88 × 223
  4. Step 4: Simplify right side
    378.40x = 116,379.24
  5. Step 5: Solve for x
    x = 116,379.24/378.40
  6. Step 6: Final answer
    x = 307.56

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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.