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Finding the Fourth Proportional to 661.44, 990.38 and 441.40

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Solution

The fourth proportional to 661.44, 990.38 and 441.40 is: 660.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.44 : 990.38 = 441.40 : x
  2. Step 2: Convert to fraction form
    661.44/990.38 = 441.40/x
  3. Step 3: Cross multiply
    661.44x = 990.38 × 441.40
  4. Step 4: Simplify right side
    661.44x = 437,153.73
  5. Step 5: Solve for x
    x = 437,153.73/661.44
  6. Step 6: Final answer
    x = 660.91

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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.