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Finding the Fourth Proportional to 641.42, 961.38 and 486.83

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Solution

The fourth proportional to 641.42, 961.38 and 486.83 is: 729.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.42 : 961.38 = 486.83 : x
  2. Step 2: Convert to fraction form
    641.42/961.38 = 486.83/x
  3. Step 3: Cross multiply
    641.42x = 961.38 × 486.83
  4. Step 4: Simplify right side
    641.42x = 468,028.63
  5. Step 5: Solve for x
    x = 468,028.63/641.42
  6. Step 6: Final answer
    x = 729.68

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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.