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Finding the Fourth Proportional to 378, 521.16 and 279.59

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Solution

The fourth proportional to 378, 521.16 and 279.59 is: 385.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    378 : 521.16 = 279.59 : x
  2. Step 2: Convert to fraction form
    378/521.16 = 279.59/x
  3. Step 3: Cross multiply
    378x = 521.16 × 279.59
  4. Step 4: Simplify right side
    378x = 145,711.12
  5. Step 5: Solve for x
    x = 145,711.12/378
  6. Step 6: Final answer
    x = 385.48

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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.