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Finding the Fourth Proportional to 638.71, 958.58 and 330.65

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Solution

The fourth proportional to 638.71, 958.58 and 330.65 is: 496.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.71 : 958.58 = 330.65 : x
  2. Step 2: Convert to fraction form
    638.71/958.58 = 330.65/x
  3. Step 3: Cross multiply
    638.71x = 958.58 × 330.65
  4. Step 4: Simplify right side
    638.71x = 316,955.22
  5. Step 5: Solve for x
    x = 316,955.22/638.71
  6. Step 6: Final answer
    x = 496.24

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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.