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Finding the Fourth Proportional to 450.80, 622.14 and 385.28

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Solution

The fourth proportional to 450.80, 622.14 and 385.28 is: 531.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.80 : 622.14 = 385.28 : x
  2. Step 2: Convert to fraction form
    450.80/622.14 = 385.28/x
  3. Step 3: Cross multiply
    450.80x = 622.14 × 385.28
  4. Step 4: Simplify right side
    450.80x = 239,698.10
  5. Step 5: Solve for x
    x = 239,698.10/450.80
  6. Step 6: Final answer
    x = 531.72

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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.