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Finding the Fourth Proportional to 641.43, 962.28 and 208.89

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Solution

The fourth proportional to 641.43, 962.28 and 208.89 is: 313.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.43 : 962.28 = 208.89 : x
  2. Step 2: Convert to fraction form
    641.43/962.28 = 208.89/x
  3. Step 3: Cross multiply
    641.43x = 962.28 × 208.89
  4. Step 4: Simplify right side
    641.43x = 201,010.67
  5. Step 5: Solve for x
    x = 201,010.67/641.43
  6. Step 6: Final answer
    x = 313.38

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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.