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Finding the Fourth Proportional to 1,635.42, 2,452.36 and 660.78

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Solution

The fourth proportional to 1,635.42, 2,452.36 and 660.78 is: 990.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,635.42 : 2,452.36 = 660.78 : x
  2. Step 2: Convert to fraction form
    1,635.42/2,452.36 = 660.78/x
  3. Step 3: Cross multiply
    1,635.42x = 2,452.36 × 660.78
  4. Step 4: Simplify right side
    1,635.42x = 1,620,470.44
  5. Step 5: Solve for x
    x = 1,620,470.44/1,635.42
  6. Step 6: Final answer
    x = 990.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.