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Finding the Fourth Proportional to 789.38, 1,089.39 and 440.07

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Solution

The fourth proportional to 789.38, 1,089.39 and 440.07 is: 607.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.38 : 1,089.39 = 440.07 : x
  2. Step 2: Convert to fraction form
    789.38/1,089.39 = 440.07/x
  3. Step 3: Cross multiply
    789.38x = 1,089.39 × 440.07
  4. Step 4: Simplify right side
    789.38x = 479,407.86
  5. Step 5: Solve for x
    x = 479,407.86/789.38
  6. Step 6: Final answer
    x = 607.33

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1.5x scale

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.