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Finding the Fourth Proportional to 379.40, 568.80 and 208.40

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Solution

The fourth proportional to 379.40, 568.80 and 208.40 is: 312.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.40 : 568.80 = 208.40 : x
  2. Step 2: Convert to fraction form
    379.40/568.80 = 208.40/x
  3. Step 3: Cross multiply
    379.40x = 568.80 × 208.40
  4. Step 4: Simplify right side
    379.40x = 118,537.92
  5. Step 5: Solve for x
    x = 118,537.92/379.40
  6. Step 6: Final answer
    x = 312.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.