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Finding the Fourth Proportional to 230.72, 346.04 and 86.42

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Solution

The fourth proportional to 230.72, 346.04 and 86.42 is: 129.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.72 : 346.04 = 86.42 : x
  2. Step 2: Convert to fraction form
    230.72/346.04 = 86.42/x
  3. Step 3: Cross multiply
    230.72x = 346.04 × 86.42
  4. Step 4: Simplify right side
    230.72x = 29,904.78
  5. Step 5: Solve for x
    x = 29,904.78/230.72
  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.