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Finding the Fourth Proportional to 636.11, 877.80 and 356.34

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Solution

The fourth proportional to 636.11, 877.80 and 356.34 is: 491.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.11 : 877.80 = 356.34 : x
  2. Step 2: Convert to fraction form
    636.11/877.80 = 356.34/x
  3. Step 3: Cross multiply
    636.11x = 877.80 × 356.34
  4. Step 4: Simplify right side
    636.11x = 312,790.86
  5. Step 5: Solve for x
    x = 312,790.86/636.11
  6. Step 6: Final answer
    x = 491.72

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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.