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Finding the Fourth Proportional to 355.17, 490.17 and 207.78

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Solution

The fourth proportional to 355.17, 490.17 and 207.78 is: 286.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.17 : 490.17 = 207.78 : x
  2. Step 2: Convert to fraction form
    355.17/490.17 = 207.78/x
  3. Step 3: Cross multiply
    355.17x = 490.17 × 207.78
  4. Step 4: Simplify right side
    355.17x = 101,846.46
  5. Step 5: Solve for x
    x = 101,846.46/355.17
  6. Step 6: Final answer
    x = 286.75

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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.