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Finding the Fourth Proportional to 231, 343.78 and 225.87

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Solution

The fourth proportional to 231, 343.78 and 225.87 is: 336.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    231 : 343.78 = 225.87 : x
  2. Step 2: Convert to fraction form
    231/343.78 = 225.87/x
  3. Step 3: Cross multiply
    231x = 343.78 × 225.87
  4. Step 4: Simplify right side
    231x = 77,649.59
  5. Step 5: Solve for x
    x = 77,649.59/231
  6. Step 6: Final answer
    x = 336.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.