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Finding the Fourth Proportional to 1,089.29, 1,633.95 and 439.88

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Solution

The fourth proportional to 1,089.29, 1,633.95 and 439.88 is: 659.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.29 : 1,633.95 = 439.88 : x
  2. Step 2: Convert to fraction form
    1,089.29/1,633.95 = 439.88/x
  3. Step 3: Cross multiply
    1,089.29x = 1,633.95 × 439.88
  4. Step 4: Simplify right side
    1,089.29x = 718,733.76
  5. Step 5: Solve for x
    x = 718,733.76/1,089.29
  6. Step 6: Final answer
    x = 659.82

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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.