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Finding the Fourth Proportional to 789.38, 1,089.29 and 440

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Solution

The fourth proportional to 789.38, 1,089.29 and 440 is: 607.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.38 : 1,089.29 = 440 : x
  2. Step 2: Convert to fraction form
    789.38/1,089.29 = 440/x
  3. Step 3: Cross multiply
    789.38x = 1,089.29 × 440
  4. Step 4: Simplify right side
    789.38x = 479,285.40
  5. Step 5: Solve for x
    x = 479,285.40/789.38
  6. Step 6: Final answer
    x = 607.17

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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.