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Finding the Fourth Proportional to 640.26, 883.84 and 404.42

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Solution

The fourth proportional to 640.26, 883.84 and 404.42 is: 558.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.26 : 883.84 = 404.42 : x
  2. Step 2: Convert to fraction form
    640.26/883.84 = 404.42/x
  3. Step 3: Cross multiply
    640.26x = 883.84 × 404.42
  4. Step 4: Simplify right side
    640.26x = 357,442.57
  5. Step 5: Solve for x
    x = 357,442.57/640.26
  6. Step 6: Final answer
    x = 558.28

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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.