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Finding the Fourth Proportional to 230.76, 346.08 and 86.43

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Solution

The fourth proportional to 230.76, 346.08 and 86.43 is: 129.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.76 : 346.08 = 86.43 : x
  2. Step 2: Convert to fraction form
    230.76/346.08 = 86.43/x
  3. Step 3: Cross multiply
    230.76x = 346.08 × 86.43
  4. Step 4: Simplify right side
    230.76x = 29,911.69
  5. Step 5: Solve for x
    x = 29,911.69/230.76
  6. Step 6: Final answer
    x = 129.62

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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.