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Finding the Fourth Proportional to 355.86, 491.14 and 208.58

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Solution

The fourth proportional to 355.86, 491.14 and 208.58 is: 287.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.86 : 491.14 = 208.58 : x
  2. Step 2: Convert to fraction form
    355.86/491.14 = 208.58/x
  3. Step 3: Cross multiply
    355.86x = 491.14 × 208.58
  4. Step 4: Simplify right side
    355.86x = 102,441.98
  5. Step 5: Solve for x
    x = 102,441.98/355.86
  6. Step 6: Final answer
    x = 287.87

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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.