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Finding the Fourth Proportional to 646.36, 892.38 and 449.80

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Solution

The fourth proportional to 646.36, 892.38 and 449.80 is: 621.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.36 : 892.38 = 449.80 : x
  2. Step 2: Convert to fraction form
    646.36/892.38 = 449.80/x
  3. Step 3: Cross multiply
    646.36x = 892.38 × 449.80
  4. Step 4: Simplify right side
    646.36x = 401,392.52
  5. Step 5: Solve for x
    x = 401,392.52/646.36
  6. Step 6: Final answer
    x = 621.00

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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.