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Finding the Fourth Proportional to 230.21, 345.38 and 67.90

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Solution

The fourth proportional to 230.21, 345.38 and 67.90 is: 101.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.21 : 345.38 = 67.90 : x
  2. Step 2: Convert to fraction form
    230.21/345.38 = 67.90/x
  3. Step 3: Cross multiply
    230.21x = 345.38 × 67.90
  4. Step 4: Simplify right side
    230.21x = 23,451.30
  5. Step 5: Solve for x
    x = 23,451.30/230.21
  6. Step 6: Final answer
    x = 101.87

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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.