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Finding the Fourth Proportional to 212.70, 318.71 and 186.78

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Solution

The fourth proportional to 212.70, 318.71 and 186.78 is: 279.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.70 : 318.71 = 186.78 : x
  2. Step 2: Convert to fraction form
    212.70/318.71 = 186.78/x
  3. Step 3: Cross multiply
    212.70x = 318.71 × 186.78
  4. Step 4: Simplify right side
    212.70x = 59,529.12
  5. Step 5: Solve for x
    x = 59,529.12/212.70
  6. Step 6: Final answer
    x = 279.87

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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.