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Finding the Fourth Proportional to 789.88, 1,090.62 and 479.80

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Solution

The fourth proportional to 789.88, 1,090.62 and 479.80 is: 662.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.88 : 1,090.62 = 479.80 : x
  2. Step 2: Convert to fraction form
    789.88/1,090.62 = 479.80/x
  3. Step 3: Cross multiply
    789.88x = 1,090.62 × 479.80
  4. Step 4: Simplify right side
    789.88x = 523,279.48
  5. Step 5: Solve for x
    x = 523,279.48/789.88
  6. Step 6: Final answer
    x = 662.48

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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.