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Finding the Fourth Proportional to 1,102.38, 1,520.79 and 636.30

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Solution

The fourth proportional to 1,102.38, 1,520.79 and 636.30 is: 877.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.38 : 1,520.79 = 636.30 : x
  2. Step 2: Convert to fraction form
    1,102.38/1,520.79 = 636.30/x
  3. Step 3: Cross multiply
    1,102.38x = 1,520.79 × 636.30
  4. Step 4: Simplify right side
    1,102.38x = 967,678.68
  5. Step 5: Solve for x
    x = 967,678.68/1,102.38
  6. Step 6: Final answer
    x = 877.81

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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.