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Finding the Fourth Proportional to 378, 521.76 and 274.80

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Solution

The fourth proportional to 378, 521.76 and 274.80 is: 379.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    378 : 521.76 = 274.80 : x
  2. Step 2: Convert to fraction form
    378/521.76 = 274.80/x
  3. Step 3: Cross multiply
    378x = 521.76 × 274.80
  4. Step 4: Simplify right side
    378x = 143,379.65
  5. Step 5: Solve for x
    x = 143,379.65/378
  6. Step 6: Final answer
    x = 379.31

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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.