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Finding the Fourth Proportional to 641.21, 884.58 and 404.97

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Solution

The fourth proportional to 641.21, 884.58 and 404.97 is: 558.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.21 : 884.58 = 404.97 : x
  2. Step 2: Convert to fraction form
    641.21/884.58 = 404.97/x
  3. Step 3: Cross multiply
    641.21x = 884.58 × 404.97
  4. Step 4: Simplify right side
    641.21x = 358,228.36
  5. Step 5: Solve for x
    x = 358,228.36/641.21
  6. Step 6: Final answer
    x = 558.68

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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.