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Finding the Fourth Proportional to 789.44, 1,089.46 and 440.13

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Solution

The fourth proportional to 789.44, 1,089.46 and 440.13 is: 607.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.44 : 1,089.46 = 440.13 : x
  2. Step 2: Convert to fraction form
    789.44/1,089.46 = 440.13/x
  3. Step 3: Cross multiply
    789.44x = 1,089.46 × 440.13
  4. Step 4: Simplify right side
    789.44x = 479,504.03
  5. Step 5: Solve for x
    x = 479,504.03/789.44
  6. Step 6: Final answer
    x = 607.40

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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.