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Finding the Fourth Proportional to 619.21, 929.36 and 330.85

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Solution

The fourth proportional to 619.21, 929.36 and 330.85 is: 496.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.21 : 929.36 = 330.85 : x
  2. Step 2: Convert to fraction form
    619.21/929.36 = 330.85/x
  3. Step 3: Cross multiply
    619.21x = 929.36 × 330.85
  4. Step 4: Simplify right side
    619.21x = 307,478.76
  5. Step 5: Solve for x
    x = 307,478.76/619.21
  6. Step 6: Final answer
    x = 496.57

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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.