Home / 1,089.11-1,633.80-439.79

Finding the Fourth Proportional to 1,089.11, 1,633.80 and 439.79

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Solution

The fourth proportional to 1,089.11, 1,633.80 and 439.79 is: 659.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.11 : 1,633.80 = 439.79 : x
  2. Step 2: Convert to fraction form
    1,089.11/1,633.80 = 439.79/x
  3. Step 3: Cross multiply
    1,089.11x = 1,633.80 × 439.79
  4. Step 4: Simplify right side
    1,089.11x = 718,520.73
  5. Step 5: Solve for x
    x = 718,520.73/1,089.11
  6. Step 6: Final answer
    x = 659.74

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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.