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Finding the Fourth Proportional to 230.95, 346.28 and 86.63

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Solution

The fourth proportional to 230.95, 346.28 and 86.63 is: 129.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.95 : 346.28 = 86.63 : x
  2. Step 2: Convert to fraction form
    230.95/346.28 = 86.63/x
  3. Step 3: Cross multiply
    230.95x = 346.28 × 86.63
  4. Step 4: Simplify right side
    230.95x = 29,998.24
  5. Step 5: Solve for x
    x = 29,998.24/230.95
  6. Step 6: Final answer
    x = 129.89

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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.