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Finding the Fourth Proportional to 450, 675.18 and 218.70

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Solution

The fourth proportional to 450, 675.18 and 218.70 is: 328.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    450 : 675.18 = 218.70 : x
  2. Step 2: Convert to fraction form
    450/675.18 = 218.70/x
  3. Step 3: Cross multiply
    450x = 675.18 × 218.70
  4. Step 4: Simplify right side
    450x = 147,661.87
  5. Step 5: Solve for x
    x = 147,661.87/450
  6. Step 6: Final answer
    x = 328.14

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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.