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Finding the Fourth Proportional to 641.29, 884.99 and 389.18

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Solution

The fourth proportional to 641.29, 884.99 and 389.18 is: 537.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.29 : 884.99 = 389.18 : x
  2. Step 2: Convert to fraction form
    641.29/884.99 = 389.18/x
  3. Step 3: Cross multiply
    641.29x = 884.99 × 389.18
  4. Step 4: Simplify right side
    641.29x = 344,420.41
  5. Step 5: Solve for x
    x = 344,420.41/641.29
  6. Step 6: Final answer
    x = 537.07

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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.