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Finding the Fourth Proportional to 378.72, 522.76 and 223.60

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Solution

The fourth proportional to 378.72, 522.76 and 223.60 is: 308.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.72 : 522.76 = 223.60 : x
  2. Step 2: Convert to fraction form
    378.72/522.76 = 223.60/x
  3. Step 3: Cross multiply
    378.72x = 522.76 × 223.60
  4. Step 4: Simplify right side
    378.72x = 116,889.14
  5. Step 5: Solve for x
    x = 116,889.14/378.72
  6. Step 6: Final answer
    x = 308.64

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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.