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Finding the Fourth Proportional to 380.41, 570.80 and 120.45

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Solution

The fourth proportional to 380.41, 570.80 and 120.45 is: 180.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.41 : 570.80 = 120.45 : x
  2. Step 2: Convert to fraction form
    380.41/570.80 = 120.45/x
  3. Step 3: Cross multiply
    380.41x = 570.80 × 120.45
  4. Step 4: Simplify right side
    380.41x = 68,754.62
  5. Step 5: Solve for x
    x = 68,754.62/380.41
  6. Step 6: Final answer
    x = 180.74

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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.