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Finding the Fourth Proportional to 443.40, 611.85 and 338.56

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Solution

The fourth proportional to 443.40, 611.85 and 338.56 is: 467.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.40 : 611.85 = 338.56 : x
  2. Step 2: Convert to fraction form
    443.40/611.85 = 338.56/x
  3. Step 3: Cross multiply
    443.40x = 611.85 × 338.56
  4. Step 4: Simplify right side
    443.40x = 207,145.14
  5. Step 5: Solve for x
    x = 207,145.14/443.40
  6. Step 6: Final answer
    x = 467.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.