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Finding the Fourth Proportional to 1,089.87, 1,635.44 and 441.15

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Solution

The fourth proportional to 1,089.87, 1,635.44 and 441.15 is: 661.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.87 : 1,635.44 = 441.15 : x
  2. Step 2: Convert to fraction form
    1,089.87/1,635.44 = 441.15/x
  3. Step 3: Cross multiply
    1,089.87x = 1,635.44 × 441.15
  4. Step 4: Simplify right side
    1,089.87x = 721,472.15
  5. Step 5: Solve for x
    x = 721,472.15/1,089.87
  6. Step 6: Final answer
    x = 661.98

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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.