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Finding the Fourth Proportional to 390.33, 582.72 and 331.94

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Solution

The fourth proportional to 390.33, 582.72 and 331.94 is: 495.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.33 : 582.72 = 331.94 : x
  2. Step 2: Convert to fraction form
    390.33/582.72 = 331.94/x
  3. Step 3: Cross multiply
    390.33x = 582.72 × 331.94
  4. Step 4: Simplify right side
    390.33x = 193,428.08
  5. Step 5: Solve for x
    x = 193,428.08/390.33
  6. Step 6: Final answer
    x = 495.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.