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Finding the Fourth Proportional to 641.83, 961.99 and 271.56

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Solution

The fourth proportional to 641.83, 961.99 and 271.56 is: 407.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.83 : 961.99 = 271.56 : x
  2. Step 2: Convert to fraction form
    641.83/961.99 = 271.56/x
  3. Step 3: Cross multiply
    641.83x = 961.99 × 271.56
  4. Step 4: Simplify right side
    641.83x = 261,238.00
  5. Step 5: Solve for x
    x = 261,238.00/641.83
  6. Step 6: Final answer
    x = 407.02

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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.