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Finding the Fourth Proportional to 378.48, 522.20 and 223.14

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Solution

The fourth proportional to 378.48, 522.20 and 223.14 is: 307.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.48 : 522.20 = 223.14 : x
  2. Step 2: Convert to fraction form
    378.48/522.20 = 223.14/x
  3. Step 3: Cross multiply
    378.48x = 522.20 × 223.14
  4. Step 4: Simplify right side
    378.48x = 116,523.71
  5. Step 5: Solve for x
    x = 116,523.71/378.48
  6. Step 6: Final answer
    x = 307.87

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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.