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Finding the Fourth Proportional to 355.88, 491.09 and 208.50

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Solution

The fourth proportional to 355.88, 491.09 and 208.50 is: 287.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.88 : 491.09 = 208.50 : x
  2. Step 2: Convert to fraction form
    355.88/491.09 = 208.50/x
  3. Step 3: Cross multiply
    355.88x = 491.09 × 208.50
  4. Step 4: Simplify right side
    355.88x = 102,391.22
  5. Step 5: Solve for x
    x = 102,391.22/355.88
  6. Step 6: Final answer
    x = 287.72

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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.