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Finding the Fourth Proportional to 764.63, 1,147.41 and 331.79

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Solution

The fourth proportional to 764.63, 1,147.41 and 331.79 is: 497.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.63 : 1,147.41 = 331.79 : x
  2. Step 2: Convert to fraction form
    764.63/1,147.41 = 331.79/x
  3. Step 3: Cross multiply
    764.63x = 1,147.41 × 331.79
  4. Step 4: Simplify right side
    764.63x = 380,696.49
  5. Step 5: Solve for x
    x = 380,696.49/764.63
  6. Step 6: Final answer
    x = 497.88

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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.