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Finding the Fourth Proportional to 212.28, 319.68 and 185.54

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Solution

The fourth proportional to 212.28, 319.68 and 185.54 is: 279.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.28 : 319.68 = 185.54 : x
  2. Step 2: Convert to fraction form
    212.28/319.68 = 185.54/x
  3. Step 3: Cross multiply
    212.28x = 319.68 × 185.54
  4. Step 4: Simplify right side
    212.28x = 59,313.43
  5. Step 5: Solve for x
    x = 59,313.43/212.28
  6. Step 6: Final answer
    x = 279.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.