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Finding the Fourth Proportional to 640.47, 884.74 and 494.94

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Solution

The fourth proportional to 640.47, 884.74 and 494.94 is: 683.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.47 : 884.74 = 494.94 : x
  2. Step 2: Convert to fraction form
    640.47/884.74 = 494.94/x
  3. Step 3: Cross multiply
    640.47x = 884.74 × 494.94
  4. Step 4: Simplify right side
    640.47x = 437,896.22
  5. Step 5: Solve for x
    x = 437,896.22/640.47
  6. Step 6: Final answer
    x = 683.71

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Why These Related Problems?

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