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Finding the Fourth Proportional to 380.92, 570.99 and 218.28

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Solution

The fourth proportional to 380.92, 570.99 and 218.28 is: 327.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.92 : 570.99 = 218.28 : x
  2. Step 2: Convert to fraction form
    380.92/570.99 = 218.28/x
  3. Step 3: Cross multiply
    380.92x = 570.99 × 218.28
  4. Step 4: Simplify right side
    380.92x = 124,635.70
  5. Step 5: Solve for x
    x = 124,635.70/380.92
  6. Step 6: Final answer
    x = 327.20

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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.