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Finding the Fourth Proportional to 641.33, 884.58 and 389.25

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Solution

The fourth proportional to 641.33, 884.58 and 389.25 is: 536.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.33 : 884.58 = 389.25 : x
  2. Step 2: Convert to fraction form
    641.33/884.58 = 389.25/x
  3. Step 3: Cross multiply
    641.33x = 884.58 × 389.25
  4. Step 4: Simplify right side
    641.33x = 344,322.77
  5. Step 5: Solve for x
    x = 344,322.77/641.33
  6. Step 6: Final answer
    x = 536.89

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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.