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Finding the Fourth Proportional to 789.43, 1,090.10 and 495.20

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Solution

The fourth proportional to 789.43, 1,090.10 and 495.20 is: 683.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.43 : 1,090.10 = 495.20 : x
  2. Step 2: Convert to fraction form
    789.43/1,090.10 = 495.20/x
  3. Step 3: Cross multiply
    789.43x = 1,090.10 × 495.20
  4. Step 4: Simplify right side
    789.43x = 539,817.52
  5. Step 5: Solve for x
    x = 539,817.52/789.43
  6. Step 6: Final answer
    x = 683.81

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Double scale
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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.