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Finding the Fourth Proportional to 380.76, 570.22 and 217.95

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Solution

The fourth proportional to 380.76, 570.22 and 217.95 is: 326.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.76 : 570.22 = 217.95 : x
  2. Step 2: Convert to fraction form
    380.76/570.22 = 217.95/x
  3. Step 3: Cross multiply
    380.76x = 570.22 × 217.95
  4. Step 4: Simplify right side
    380.76x = 124,279.45
  5. Step 5: Solve for x
    x = 124,279.45/380.76
  6. Step 6: Final answer
    x = 326.40

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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.