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Finding the Fourth Proportional to 378.28, 520.88 and 356.36

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Solution

The fourth proportional to 378.28, 520.88 and 356.36 is: 490.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.28 : 520.88 = 356.36 : x
  2. Step 2: Convert to fraction form
    378.28/520.88 = 356.36/x
  3. Step 3: Cross multiply
    378.28x = 520.88 × 356.36
  4. Step 4: Simplify right side
    378.28x = 185,620.80
  5. Step 5: Solve for x
    x = 185,620.80/378.28
  6. Step 6: Final answer
    x = 490.70

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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.