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Finding the Fourth Proportional to 641.21, 884.60 and 405.07

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Solution

The fourth proportional to 641.21, 884.60 and 405.07 is: 558.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.21 : 884.60 = 405.07 : x
  2. Step 2: Convert to fraction form
    641.21/884.60 = 405.07/x
  3. Step 3: Cross multiply
    641.21x = 884.60 × 405.07
  4. Step 4: Simplify right side
    641.21x = 358,323.72
  5. Step 5: Solve for x
    x = 358,323.72/641.21
  6. Step 6: Final answer
    x = 558.83

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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.