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Finding the Fourth Proportional to 380.11, 570.18 and 217.72

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Solution

The fourth proportional to 380.11, 570.18 and 217.72 is: 326.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.11 : 570.18 = 217.72 : x
  2. Step 2: Convert to fraction form
    380.11/570.18 = 217.72/x
  3. Step 3: Cross multiply
    380.11x = 570.18 × 217.72
  4. Step 4: Simplify right side
    380.11x = 124,139.59
  5. Step 5: Solve for x
    x = 124,139.59/380.11
  6. Step 6: Final answer
    x = 326.59

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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.