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Finding the Fourth Proportional to 641.63, 962.55 and 208.69

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Solution

The fourth proportional to 641.63, 962.55 and 208.69 is: 313.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.63 : 962.55 = 208.69 : x
  2. Step 2: Convert to fraction form
    641.63/962.55 = 208.69/x
  3. Step 3: Cross multiply
    641.63x = 962.55 × 208.69
  4. Step 4: Simplify right side
    641.63x = 200,872.15
  5. Step 5: Solve for x
    x = 200,872.15/641.63
  6. Step 6: Final answer
    x = 313.06

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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.