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Finding the Fourth Proportional to 820.95, 1,231.77 and 333.88

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Solution

The fourth proportional to 820.95, 1,231.77 and 333.88 is: 500.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.95 : 1,231.77 = 333.88 : x
  2. Step 2: Convert to fraction form
    820.95/1,231.77 = 333.88/x
  3. Step 3: Cross multiply
    820.95x = 1,231.77 × 333.88
  4. Step 4: Simplify right side
    820.95x = 411,263.37
  5. Step 5: Solve for x
    x = 411,263.37/820.95
  6. Step 6: Final answer
    x = 500.96

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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.