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Finding the Fourth Proportional to 355.23, 490.09 and 207.78

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Solution

The fourth proportional to 355.23, 490.09 and 207.78 is: 286.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.23 : 490.09 = 207.78 : x
  2. Step 2: Convert to fraction form
    355.23/490.09 = 207.78/x
  3. Step 3: Cross multiply
    355.23x = 490.09 × 207.78
  4. Step 4: Simplify right side
    355.23x = 101,830.90
  5. Step 5: Solve for x
    x = 101,830.90/355.23
  6. Step 6: Final answer
    x = 286.66

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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.