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Finding the Fourth Proportional to 764.22, 1,145.37 and 330.87

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Solution

The fourth proportional to 764.22, 1,145.37 and 330.87 is: 495.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.22 : 1,145.37 = 330.87 : x
  2. Step 2: Convert to fraction form
    764.22/1,145.37 = 330.87/x
  3. Step 3: Cross multiply
    764.22x = 1,145.37 × 330.87
  4. Step 4: Simplify right side
    764.22x = 378,968.57
  5. Step 5: Solve for x
    x = 378,968.57/764.22
  6. Step 6: Final answer
    x = 495.89

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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.