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Finding the Fourth Proportional to 665.14, 991.02 and 627.88

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Solution

The fourth proportional to 665.14, 991.02 and 627.88 is: 935.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.14 : 991.02 = 627.88 : x
  2. Step 2: Convert to fraction form
    665.14/991.02 = 627.88/x
  3. Step 3: Cross multiply
    665.14x = 991.02 × 627.88
  4. Step 4: Simplify right side
    665.14x = 622,236.68
  5. Step 5: Solve for x
    x = 622,236.68/665.14
  6. Step 6: Final answer
    x = 935.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.