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Finding the Fourth Proportional to 1,089.83, 1,634.81 and 440.56

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Solution

The fourth proportional to 1,089.83, 1,634.81 and 440.56 is: 660.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.83 : 1,634.81 = 440.56 : x
  2. Step 2: Convert to fraction form
    1,089.83/1,634.81 = 440.56/x
  3. Step 3: Cross multiply
    1,089.83x = 1,634.81 × 440.56
  4. Step 4: Simplify right side
    1,089.83x = 720,231.89
  5. Step 5: Solve for x
    x = 720,231.89/1,089.83
  6. Step 6: Final answer
    x = 660.87

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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.