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Finding the Fourth Proportional to 660.96, 991.81 and 455.69

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Solution

The fourth proportional to 660.96, 991.81 and 455.69 is: 683.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.96 : 991.81 = 455.69 : x
  2. Step 2: Convert to fraction form
    660.96/991.81 = 455.69/x
  3. Step 3: Cross multiply
    660.96x = 991.81 × 455.69
  4. Step 4: Simplify right side
    660.96x = 451,957.90
  5. Step 5: Solve for x
    x = 451,957.90/660.96
  6. Step 6: Final answer
    x = 683.79

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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.