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Finding the Fourth Proportional to 646.26, 891.90 and 449.88

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Solution

The fourth proportional to 646.26, 891.90 and 449.88 is: 620.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.26 : 891.90 = 449.88 : x
  2. Step 2: Convert to fraction form
    646.26/891.90 = 449.88/x
  3. Step 3: Cross multiply
    646.26x = 891.90 × 449.88
  4. Step 4: Simplify right side
    646.26x = 401,247.97
  5. Step 5: Solve for x
    x = 401,247.97/646.26
  6. Step 6: Final answer
    x = 620.88

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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.