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Finding the Fourth Proportional to 380.68, 570.90 and 120.67

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Solution

The fourth proportional to 380.68, 570.90 and 120.67 is: 180.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.68 : 570.90 = 120.67 : x
  2. Step 2: Convert to fraction form
    380.68/570.90 = 120.67/x
  3. Step 3: Cross multiply
    380.68x = 570.90 × 120.67
  4. Step 4: Simplify right side
    380.68x = 68,890.50
  5. Step 5: Solve for x
    x = 68,890.50/380.68
  6. Step 6: Final answer
    x = 180.97

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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.