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Finding the Fourth Proportional to 355.95, 491.21 and 208.59

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Solution

The fourth proportional to 355.95, 491.21 and 208.59 is: 287.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.95 : 491.21 = 208.59 : x
  2. Step 2: Convert to fraction form
    355.95/491.21 = 208.59/x
  3. Step 3: Cross multiply
    355.95x = 491.21 × 208.59
  4. Step 4: Simplify right side
    355.95x = 102,460.45
  5. Step 5: Solve for x
    x = 102,460.45/355.95
  6. Step 6: Final answer
    x = 287.85

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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.