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Finding the Fourth Proportional to 805.50, 1,110.80 and 490.82

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Solution

The fourth proportional to 805.50, 1,110.80 and 490.82 is: 676.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.50 : 1,110.80 = 490.82 : x
  2. Step 2: Convert to fraction form
    805.50/1,110.80 = 490.82/x
  3. Step 3: Cross multiply
    805.50x = 1,110.80 × 490.82
  4. Step 4: Simplify right side
    805.50x = 545,194.85
  5. Step 5: Solve for x
    x = 545,194.85/805.50
  6. Step 6: Final answer
    x = 676.84

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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.