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Finding the Fourth Proportional to 640.69, 884.24 and 391.96

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Solution

The fourth proportional to 640.69, 884.24 and 391.96 is: 540.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.69 : 884.24 = 391.96 : x
  2. Step 2: Convert to fraction form
    640.69/884.24 = 391.96/x
  3. Step 3: Cross multiply
    640.69x = 884.24 × 391.96
  4. Step 4: Simplify right side
    640.69x = 346,586.71
  5. Step 5: Solve for x
    x = 346,586.71/640.69
  6. Step 6: Final answer
    x = 540.96

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.