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Finding the Fourth Proportional to 638.17, 957.47 and 329.86

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Solution

The fourth proportional to 638.17, 957.47 and 329.86 is: 494.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.17 : 957.47 = 329.86 : x
  2. Step 2: Convert to fraction form
    638.17/957.47 = 329.86/x
  3. Step 3: Cross multiply
    638.17x = 957.47 × 329.86
  4. Step 4: Simplify right side
    638.17x = 315,831.05
  5. Step 5: Solve for x
    x = 315,831.05/638.17
  6. Step 6: Final answer
    x = 494.90

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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.