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Finding the Fourth Proportional to 449.35, 618.28 and 438.55

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Solution

The fourth proportional to 449.35, 618.28 and 438.55 is: 603.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.35 : 618.28 = 438.55 : x
  2. Step 2: Convert to fraction form
    449.35/618.28 = 438.55/x
  3. Step 3: Cross multiply
    449.35x = 618.28 × 438.55
  4. Step 4: Simplify right side
    449.35x = 271,146.69
  5. Step 5: Solve for x
    x = 271,146.69/449.35
  6. Step 6: Final answer
    x = 603.42

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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.