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Finding the Fourth Proportional to 636.20, 877.96 and 387.48

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Solution

The fourth proportional to 636.20, 877.96 and 387.48 is: 534.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.20 : 877.96 = 387.48 : x
  2. Step 2: Convert to fraction form
    636.20/877.96 = 387.48/x
  3. Step 3: Cross multiply
    636.20x = 877.96 × 387.48
  4. Step 4: Simplify right side
    636.20x = 340,191.94
  5. Step 5: Solve for x
    x = 340,191.94/636.20
  6. Step 6: Final answer
    x = 534.72

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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.