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Finding the Fourth Proportional to 636.48, 877.92 and 439.68

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Solution

The fourth proportional to 636.48, 877.92 and 439.68 is: 606.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.48 : 877.92 = 439.68 : x
  2. Step 2: Convert to fraction form
    636.48/877.92 = 439.68/x
  3. Step 3: Cross multiply
    636.48x = 877.92 × 439.68
  4. Step 4: Simplify right side
    636.48x = 386,003.87
  5. Step 5: Solve for x
    x = 386,003.87/636.48
  6. Step 6: Final answer
    x = 606.47

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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.