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Finding the Fourth Proportional to 490.74, 732.30 and 438.81

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Solution

The fourth proportional to 490.74, 732.30 and 438.81 is: 654.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.74 : 732.30 = 438.81 : x
  2. Step 2: Convert to fraction form
    490.74/732.30 = 438.81/x
  3. Step 3: Cross multiply
    490.74x = 732.30 × 438.81
  4. Step 4: Simplify right side
    490.74x = 321,340.56
  5. Step 5: Solve for x
    x = 321,340.56/490.74
  6. Step 6: Final answer
    x = 654.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.