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Finding the Fourth Proportional to 380.50, 570.84 and 120.51

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Solution

The fourth proportional to 380.50, 570.84 and 120.51 is: 180.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.50 : 570.84 = 120.51 : x
  2. Step 2: Convert to fraction form
    380.50/570.84 = 120.51/x
  3. Step 3: Cross multiply
    380.50x = 570.84 × 120.51
  4. Step 4: Simplify right side
    380.50x = 68,791.93
  5. Step 5: Solve for x
    x = 68,791.93/380.50
  6. Step 6: Final answer
    x = 180.79

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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.