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Finding the Fourth Proportional to 355.65, 490.78 and 200.40

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Solution

The fourth proportional to 355.65, 490.78 and 200.40 is: 276.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.65 : 490.78 = 200.40 : x
  2. Step 2: Convert to fraction form
    355.65/490.78 = 200.40/x
  3. Step 3: Cross multiply
    355.65x = 490.78 × 200.40
  4. Step 4: Simplify right side
    355.65x = 98,350.72
  5. Step 5: Solve for x
    x = 98,350.72/355.65
  6. Step 6: Final answer
    x = 276.54

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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.