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Finding the Fourth Proportional to 355.96, 491.15 and 208.51

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Solution

The fourth proportional to 355.96, 491.15 and 208.51 is: 287.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.96 : 491.15 = 208.51 : x
  2. Step 2: Convert to fraction form
    355.96/491.15 = 208.51/x
  3. Step 3: Cross multiply
    355.96x = 491.15 × 208.51
  4. Step 4: Simplify right side
    355.96x = 102,409.69
  5. Step 5: Solve for x
    x = 102,409.69/355.96
  6. Step 6: Final answer
    x = 287.70

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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.