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Finding the Fourth Proportional to 449.10, 620.43 and 355.55

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Solution

The fourth proportional to 449.10, 620.43 and 355.55 is: 491.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.10 : 620.43 = 355.55 : x
  2. Step 2: Convert to fraction form
    449.10/620.43 = 355.55/x
  3. Step 3: Cross multiply
    449.10x = 620.43 × 355.55
  4. Step 4: Simplify right side
    449.10x = 220,589.45
  5. Step 5: Solve for x
    x = 220,589.45/449.10
  6. Step 6: Final answer
    x = 491.18

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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.