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Finding the Fourth Proportional to 211.21, 315.01 and 178.92

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Solution

The fourth proportional to 211.21, 315.01 and 178.92 is: 266.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.21 : 315.01 = 178.92 : x
  2. Step 2: Convert to fraction form
    211.21/315.01 = 178.92/x
  3. Step 3: Cross multiply
    211.21x = 315.01 × 178.92
  4. Step 4: Simplify right side
    211.21x = 56,361.81
  5. Step 5: Solve for x
    x = 56,361.81/211.21
  6. Step 6: Final answer
    x = 266.86

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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.