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Finding the Fourth Proportional to 627.75, 865.98 and 406.80

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Solution

The fourth proportional to 627.75, 865.98 and 406.80 is: 561.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.75 : 865.98 = 406.80 : x
  2. Step 2: Convert to fraction form
    627.75/865.98 = 406.80/x
  3. Step 3: Cross multiply
    627.75x = 865.98 × 406.80
  4. Step 4: Simplify right side
    627.75x = 352,280.66
  5. Step 5: Solve for x
    x = 352,280.66/627.75
  6. Step 6: Final answer
    x = 561.18

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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.