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Finding the Fourth Proportional to 230.43, 345.41 and 120.78

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Solution

The fourth proportional to 230.43, 345.41 and 120.78 is: 181.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.43 : 345.41 = 120.78 : x
  2. Step 2: Convert to fraction form
    230.43/345.41 = 120.78/x
  3. Step 3: Cross multiply
    230.43x = 345.41 × 120.78
  4. Step 4: Simplify right side
    230.43x = 41,718.62
  5. Step 5: Solve for x
    x = 41,718.62/230.43
  6. Step 6: Final answer
    x = 181.05

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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.