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Finding the Fourth Proportional to 450.40, 674.56 and 438.11

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Solution

The fourth proportional to 450.40, 674.56 and 438.11 is: 656.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.40 : 674.56 = 438.11 : x
  2. Step 2: Convert to fraction form
    450.40/674.56 = 438.11/x
  3. Step 3: Cross multiply
    450.40x = 674.56 × 438.11
  4. Step 4: Simplify right side
    450.40x = 295,525.92
  5. Step 5: Solve for x
    x = 295,525.92/450.40
  6. Step 6: Final answer
    x = 656.14

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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.