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Finding the Fourth Proportional to 646.64, 892.37 and 351.91

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Solution

The fourth proportional to 646.64, 892.37 and 351.91 is: 485.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.64 : 892.37 = 351.91 : x
  2. Step 2: Convert to fraction form
    646.64/892.37 = 351.91/x
  3. Step 3: Cross multiply
    646.64x = 892.37 × 351.91
  4. Step 4: Simplify right side
    646.64x = 314,034.60
  5. Step 5: Solve for x
    x = 314,034.60/646.64
  6. Step 6: Final answer
    x = 485.64

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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.