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Finding the Fourth Proportional to 789.17, 1,089.01 and 439.85

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Solution

The fourth proportional to 789.17, 1,089.01 and 439.85 is: 606.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.17 : 1,089.01 = 439.85 : x
  2. Step 2: Convert to fraction form
    789.17/1,089.01 = 439.85/x
  3. Step 3: Cross multiply
    789.17x = 1,089.01 × 439.85
  4. Step 4: Simplify right side
    789.17x = 479,001.05
  5. Step 5: Solve for x
    x = 479,001.05/789.17
  6. Step 6: Final answer
    x = 606.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.