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Finding the Fourth Proportional to 789.61, 1,090 and 494.82

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Solution

The fourth proportional to 789.61, 1,090 and 494.82 is: 683.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.61 : 1,090 = 494.82 : x
  2. Step 2: Convert to fraction form
    789.61/1,090 = 494.82/x
  3. Step 3: Cross multiply
    789.61x = 1,090 × 494.82
  4. Step 4: Simplify right side
    789.61x = 539,353.80
  5. Step 5: Solve for x
    x = 539,353.80/789.61
  6. Step 6: Final answer
    x = 683.06

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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.