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Finding the Fourth Proportional to 230.20, 345.20 and 85.82

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Solution

The fourth proportional to 230.20, 345.20 and 85.82 is: 128.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.20 : 345.20 = 85.82 : x
  2. Step 2: Convert to fraction form
    230.20/345.20 = 85.82/x
  3. Step 3: Cross multiply
    230.20x = 345.20 × 85.82
  4. Step 4: Simplify right side
    230.20x = 29,625.06
  5. Step 5: Solve for x
    x = 29,625.06/230.20
  6. Step 6: Final answer
    x = 128.69

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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.