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Finding the Fourth Proportional to 229.89, 344.75 and 75.78

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Solution

The fourth proportional to 229.89, 344.75 and 75.78 is: 113.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.89 : 344.75 = 75.78 : x
  2. Step 2: Convert to fraction form
    229.89/344.75 = 75.78/x
  3. Step 3: Cross multiply
    229.89x = 344.75 × 75.78
  4. Step 4: Simplify right side
    229.89x = 26,123.43
  5. Step 5: Solve for x
    x = 26,123.43/229.89
  6. Step 6: Final answer
    x = 113.64

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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.