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Finding the Fourth Proportional to 899, 1,240.04 and 636.56

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Solution

The fourth proportional to 899, 1,240.04 and 636.56 is: 878.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    899 : 1,240.04 = 636.56 : x
  2. Step 2: Convert to fraction form
    899/1,240.04 = 636.56/x
  3. Step 3: Cross multiply
    899x = 1,240.04 × 636.56
  4. Step 4: Simplify right side
    899x = 789,359.86
  5. Step 5: Solve for x
    x = 789,359.86/899
  6. Step 6: Final answer
    x = 878.04

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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.