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Finding the Fourth Proportional to 636.16, 877.92 and 387.56

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Solution

The fourth proportional to 636.16, 877.92 and 387.56 is: 534.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.16 : 877.92 = 387.56 : x
  2. Step 2: Convert to fraction form
    636.16/877.92 = 387.56/x
  3. Step 3: Cross multiply
    636.16x = 877.92 × 387.56
  4. Step 4: Simplify right side
    636.16x = 340,246.68
  5. Step 5: Solve for x
    x = 340,246.68/636.16
  6. Step 6: Final answer
    x = 534.84

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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.