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Finding the Fourth Proportional to 627.51, 871.95 and 620.76

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Solution

The fourth proportional to 627.51, 871.95 and 620.76 is: 862.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.51 : 871.95 = 620.76 : x
  2. Step 2: Convert to fraction form
    627.51/871.95 = 620.76/x
  3. Step 3: Cross multiply
    627.51x = 871.95 × 620.76
  4. Step 4: Simplify right side
    627.51x = 541,271.68
  5. Step 5: Solve for x
    x = 541,271.68/627.51
  6. Step 6: Final answer
    x = 862.57

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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.