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Finding the Fourth Proportional to 638.93, 958.56 and 330.99

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Solution

The fourth proportional to 638.93, 958.56 and 330.99 is: 496.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.93 : 958.56 = 330.99 : x
  2. Step 2: Convert to fraction form
    638.93/958.56 = 330.99/x
  3. Step 3: Cross multiply
    638.93x = 958.56 × 330.99
  4. Step 4: Simplify right side
    638.93x = 317,273.77
  5. Step 5: Solve for x
    x = 317,273.77/638.93
  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.