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Finding the Fourth Proportional to 641.43, 885.17 and 346.69

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Solution

The fourth proportional to 641.43, 885.17 and 346.69 is: 478.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.43 : 885.17 = 346.69 : x
  2. Step 2: Convert to fraction form
    641.43/885.17 = 346.69/x
  3. Step 3: Cross multiply
    641.43x = 885.17 × 346.69
  4. Step 4: Simplify right side
    641.43x = 306,883.07
  5. Step 5: Solve for x
    x = 306,883.07/641.43
  6. Step 6: Final answer
    x = 478.44

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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.