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Finding the Fourth Proportional to 803.65, 1,108.99 and 449.56

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Solution

The fourth proportional to 803.65, 1,108.99 and 449.56 is: 620.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.65 : 1,108.99 = 449.56 : x
  2. Step 2: Convert to fraction form
    803.65/1,108.99 = 449.56/x
  3. Step 3: Cross multiply
    803.65x = 1,108.99 × 449.56
  4. Step 4: Simplify right side
    803.65x = 498,557.54
  5. Step 5: Solve for x
    x = 498,557.54/803.65
  6. Step 6: Final answer
    x = 620.37

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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.