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Finding the Fourth Proportional to 441.81, 663.07 and 438.40

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Solution

The fourth proportional to 441.81, 663.07 and 438.40 is: 657.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.81 : 663.07 = 438.40 : x
  2. Step 2: Convert to fraction form
    441.81/663.07 = 438.40/x
  3. Step 3: Cross multiply
    441.81x = 663.07 × 438.40
  4. Step 4: Simplify right side
    441.81x = 290,687.13
  5. Step 5: Solve for x
    x = 290,687.13/441.81
  6. Step 6: Final answer
    x = 657.95

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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.