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Finding the Fourth Proportional to 641.36, 962 and 208.40

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Solution

The fourth proportional to 641.36, 962 and 208.40 is: 312.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.36 : 962 = 208.40 : x
  2. Step 2: Convert to fraction form
    641.36/962 = 208.40/x
  3. Step 3: Cross multiply
    641.36x = 962 × 208.40
  4. Step 4: Simplify right side
    641.36x = 200,480.80
  5. Step 5: Solve for x
    x = 200,480.80/641.36
  6. Step 6: Final answer
    x = 312.59

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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.