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Finding the Fourth Proportional to 641.01, 961.80 and 311.77

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Solution

The fourth proportional to 641.01, 961.80 and 311.77 is: 467.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.01 : 961.80 = 311.77 : x
  2. Step 2: Convert to fraction form
    641.01/961.80 = 311.77/x
  3. Step 3: Cross multiply
    641.01x = 961.80 × 311.77
  4. Step 4: Simplify right side
    641.01x = 299,855.58
  5. Step 5: Solve for x
    x = 299,855.58/641.01
  6. Step 6: Final answer
    x = 467.79

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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.