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Finding the Fourth Proportional to 228.65, 343.08 and 91.79

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Solution

The fourth proportional to 228.65, 343.08 and 91.79 is: 137.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.65 : 343.08 = 91.79 : x
  2. Step 2: Convert to fraction form
    228.65/343.08 = 91.79/x
  3. Step 3: Cross multiply
    228.65x = 343.08 × 91.79
  4. Step 4: Simplify right side
    228.65x = 31,490.88
  5. Step 5: Solve for x
    x = 31,490.88/228.65
  6. Step 6: Final answer
    x = 137.73

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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.