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Finding the Fourth Proportional to 465.50, 640.53 and 449.54

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Solution

The fourth proportional to 465.50, 640.53 and 449.54 is: 618.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.50 : 640.53 = 449.54 : x
  2. Step 2: Convert to fraction form
    465.50/640.53 = 449.54/x
  3. Step 3: Cross multiply
    465.50x = 640.53 × 449.54
  4. Step 4: Simplify right side
    465.50x = 287,943.86
  5. Step 5: Solve for x
    x = 287,943.86/465.50
  6. Step 6: Final answer
    x = 618.57

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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.