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Finding the Fourth Proportional to 1,089.75, 1,635.12 and 440.37

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Solution

The fourth proportional to 1,089.75, 1,635.12 and 440.37 is: 660.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.75 : 1,635.12 = 440.37 : x
  2. Step 2: Convert to fraction form
    1,089.75/1,635.12 = 440.37/x
  3. Step 3: Cross multiply
    1,089.75x = 1,635.12 × 440.37
  4. Step 4: Simplify right side
    1,089.75x = 720,057.79
  5. Step 5: Solve for x
    x = 720,057.79/1,089.75
  6. Step 6: Final answer
    x = 660.76

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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.