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Finding the Fourth Proportional to 636.11, 877.90 and 356.35

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Solution

The fourth proportional to 636.11, 877.90 and 356.35 is: 491.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.11 : 877.90 = 356.35 : x
  2. Step 2: Convert to fraction form
    636.11/877.90 = 356.35/x
  3. Step 3: Cross multiply
    636.11x = 877.90 × 356.35
  4. Step 4: Simplify right side
    636.11x = 312,836.58
  5. Step 5: Solve for x
    x = 312,836.58/636.11
  6. Step 6: Final answer
    x = 491.79

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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.