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Finding the Fourth Proportional to 213.76, 319.12 and 188.32

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Solution

The fourth proportional to 213.76, 319.12 and 188.32 is: 281.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.76 : 319.12 = 188.32 : x
  2. Step 2: Convert to fraction form
    213.76/319.12 = 188.32/x
  3. Step 3: Cross multiply
    213.76x = 319.12 × 188.32
  4. Step 4: Simplify right side
    213.76x = 60,096.68
  5. Step 5: Solve for x
    x = 60,096.68/213.76
  6. Step 6: Final answer
    x = 281.14

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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.