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Finding the Fourth Proportional to 572.82, 789.91 and 490.20

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Solution

The fourth proportional to 572.82, 789.91 and 490.20 is: 675.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.82 : 789.91 = 490.20 : x
  2. Step 2: Convert to fraction form
    572.82/789.91 = 490.20/x
  3. Step 3: Cross multiply
    572.82x = 789.91 × 490.20
  4. Step 4: Simplify right side
    572.82x = 387,213.88
  5. Step 5: Solve for x
    x = 387,213.88/572.82
  6. Step 6: Final answer
    x = 675.98

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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.