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Finding the Fourth Proportional to 211.50, 316.89 and 133.43

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Solution

The fourth proportional to 211.50, 316.89 and 133.43 is: 199.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.50 : 316.89 = 133.43 : x
  2. Step 2: Convert to fraction form
    211.50/316.89 = 133.43/x
  3. Step 3: Cross multiply
    211.50x = 316.89 × 133.43
  4. Step 4: Simplify right side
    211.50x = 42,281.05
  5. Step 5: Solve for x
    x = 42,281.05/211.50
  6. Step 6: Final answer
    x = 199.91

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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.