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Finding the Fourth Proportional to 716.09, 989.21 and 627.39

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Solution

The fourth proportional to 716.09, 989.21 and 627.39 is: 866.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.09 : 989.21 = 627.39 : x
  2. Step 2: Convert to fraction form
    716.09/989.21 = 627.39/x
  3. Step 3: Cross multiply
    716.09x = 989.21 × 627.39
  4. Step 4: Simplify right side
    716.09x = 620,622.03
  5. Step 5: Solve for x
    x = 620,622.03/716.09
  6. Step 6: Final answer
    x = 866.69

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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.