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Finding the Fourth Proportional to 661.97, 990.63 and 453.80

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Solution

The fourth proportional to 661.97, 990.63 and 453.80 is: 679.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.97 : 990.63 = 453.80 : x
  2. Step 2: Convert to fraction form
    661.97/990.63 = 453.80/x
  3. Step 3: Cross multiply
    661.97x = 990.63 × 453.80
  4. Step 4: Simplify right side
    661.97x = 449,550.37
  5. Step 5: Solve for x
    x = 449,550.37/661.97
  6. Step 6: Final answer
    x = 679.11

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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.