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Finding the Fourth Proportional to 660.75, 991.11 and 620.66

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Solution

The fourth proportional to 660.75, 991.11 and 620.66 is: 930.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.75 : 991.11 = 620.66 : x
  2. Step 2: Convert to fraction form
    660.75/991.11 = 620.66/x
  3. Step 3: Cross multiply
    660.75x = 991.11 × 620.66
  4. Step 4: Simplify right side
    660.75x = 615,137.38
  5. Step 5: Solve for x
    x = 615,137.38/660.75
  6. Step 6: Final answer
    x = 930.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.