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Finding the Fourth Proportional to 799.82, 1,103.78 and 485.15

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Solution

The fourth proportional to 799.82, 1,103.78 and 485.15 is: 669.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.82 : 1,103.78 = 485.15 : x
  2. Step 2: Convert to fraction form
    799.82/1,103.78 = 485.15/x
  3. Step 3: Cross multiply
    799.82x = 1,103.78 × 485.15
  4. Step 4: Simplify right side
    799.82x = 535,490.92
  5. Step 5: Solve for x
    x = 535,490.92/799.82
  6. Step 6: Final answer
    x = 669.52

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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.