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Finding the Fourth Proportional to 465.75, 642.74 and 255.95

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Solution

The fourth proportional to 465.75, 642.74 and 255.95 is: 353.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.75 : 642.74 = 255.95 : x
  2. Step 2: Convert to fraction form
    465.75/642.74 = 255.95/x
  3. Step 3: Cross multiply
    465.75x = 642.74 × 255.95
  4. Step 4: Simplify right side
    465.75x = 164,506.09
  5. Step 5: Solve for x
    x = 164,506.09/465.75
  6. Step 6: Final answer
    x = 353.21

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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.