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Finding the Fourth Proportional to 627.12, 871.54 and 620.64

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Solution

The fourth proportional to 627.12, 871.54 and 620.64 is: 862.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.12 : 871.54 = 620.64 : x
  2. Step 2: Convert to fraction form
    627.12/871.54 = 620.64/x
  3. Step 3: Cross multiply
    627.12x = 871.54 × 620.64
  4. Step 4: Simplify right side
    627.12x = 540,912.59
  5. Step 5: Solve for x
    x = 540,912.59/627.12
  6. Step 6: Final answer
    x = 862.53

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.