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Finding the Fourth Proportional to 378, 521.64 and 356.40

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Solution

The fourth proportional to 378, 521.64 and 356.40 is: 491.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    378 : 521.64 = 356.40 : x
  2. Step 2: Convert to fraction form
    378/521.64 = 356.40/x
  3. Step 3: Cross multiply
    378x = 521.64 × 356.40
  4. Step 4: Simplify right side
    378x = 185,912.50
  5. Step 5: Solve for x
    x = 185,912.50/378
  6. Step 6: Final answer
    x = 491.83

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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.