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Finding the Fourth Proportional to 641.69, 885.53 and 379.71

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Solution

The fourth proportional to 641.69, 885.53 and 379.71 is: 524.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.69 : 885.53 = 379.71 : x
  2. Step 2: Convert to fraction form
    641.69/885.53 = 379.71/x
  3. Step 3: Cross multiply
    641.69x = 885.53 × 379.71
  4. Step 4: Simplify right side
    641.69x = 336,244.60
  5. Step 5: Solve for x
    x = 336,244.60/641.69
  6. Step 6: Final answer
    x = 524.00

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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.