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Finding the Fourth Proportional to 230.45, 345.68 and 86.15

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Solution

The fourth proportional to 230.45, 345.68 and 86.15 is: 129.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.45 : 345.68 = 86.15 : x
  2. Step 2: Convert to fraction form
    230.45/345.68 = 86.15/x
  3. Step 3: Cross multiply
    230.45x = 345.68 × 86.15
  4. Step 4: Simplify right side
    230.45x = 29,778.82
  5. Step 5: Solve for x
    x = 29,778.82/230.45
  6. Step 6: Final answer
    x = 129.22

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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.