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Finding the Fourth Proportional to 213.96, 318.92 and 190.70

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Solution

The fourth proportional to 213.96, 318.92 and 190.70 is: 284.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.96 : 318.92 = 190.70 : x
  2. Step 2: Convert to fraction form
    213.96/318.92 = 190.70/x
  3. Step 3: Cross multiply
    213.96x = 318.92 × 190.70
  4. Step 4: Simplify right side
    213.96x = 60,818.04
  5. Step 5: Solve for x
    x = 60,818.04/213.96
  6. Step 6: Final answer
    x = 284.25

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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.