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Finding the Fourth Proportional to 646.49, 892.15 and 351.76

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Solution

The fourth proportional to 646.49, 892.15 and 351.76 is: 485.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.49 : 892.15 = 351.76 : x
  2. Step 2: Convert to fraction form
    646.49/892.15 = 351.76/x
  3. Step 3: Cross multiply
    646.49x = 892.15 × 351.76
  4. Step 4: Simplify right side
    646.49x = 313,818.22
  5. Step 5: Solve for x
    x = 313,818.22/646.49
  6. Step 6: Final answer
    x = 485.42

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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.