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Finding the Fourth Proportional to 230.09, 345.57 and 138.95

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Solution

The fourth proportional to 230.09, 345.57 and 138.95 is: 208.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.09 : 345.57 = 138.95 : x
  2. Step 2: Convert to fraction form
    230.09/345.57 = 138.95/x
  3. Step 3: Cross multiply
    230.09x = 345.57 × 138.95
  4. Step 4: Simplify right side
    230.09x = 48,016.95
  5. Step 5: Solve for x
    x = 48,016.95/230.09
  6. Step 6: Final answer
    x = 208.69

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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.