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Finding the Fourth Proportional to 641.81, 885.61 and 376.23

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Solution

The fourth proportional to 641.81, 885.61 and 376.23 is: 519.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.81 : 885.61 = 376.23 : x
  2. Step 2: Convert to fraction form
    641.81/885.61 = 376.23/x
  3. Step 3: Cross multiply
    641.81x = 885.61 × 376.23
  4. Step 4: Simplify right side
    641.81x = 333,193.05
  5. Step 5: Solve for x
    x = 333,193.05/641.81
  6. Step 6: Final answer
    x = 519.15

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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.