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Finding the Fourth Proportional to 378.72, 522.27 and 245.75

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Solution

The fourth proportional to 378.72, 522.27 and 245.75 is: 338.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.72 : 522.27 = 245.75 : x
  2. Step 2: Convert to fraction form
    378.72/522.27 = 245.75/x
  3. Step 3: Cross multiply
    378.72x = 522.27 × 245.75
  4. Step 4: Simplify right side
    378.72x = 128,345.24
  5. Step 5: Solve for x
    x = 128,345.24/378.72
  6. Step 6: Final answer
    x = 338.89

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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.