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Finding the Fourth Proportional to 358.12, 494.12 and 208.70

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Solution

The fourth proportional to 358.12, 494.12 and 208.70 is: 287.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.12 : 494.12 = 208.70 : x
  2. Step 2: Convert to fraction form
    358.12/494.12 = 208.70/x
  3. Step 3: Cross multiply
    358.12x = 494.12 × 208.70
  4. Step 4: Simplify right side
    358.12x = 103,122.84
  5. Step 5: Solve for x
    x = 103,122.84/358.12
  6. Step 6: Final answer
    x = 287.96

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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.