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Finding the Fourth Proportional to 211.85, 316.99 and 134.45

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Solution

The fourth proportional to 211.85, 316.99 and 134.45 is: 201.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.85 : 316.99 = 134.45 : x
  2. Step 2: Convert to fraction form
    211.85/316.99 = 134.45/x
  3. Step 3: Cross multiply
    211.85x = 316.99 × 134.45
  4. Step 4: Simplify right side
    211.85x = 42,619.08
  5. Step 5: Solve for x
    x = 42,619.08/211.85
  6. Step 6: Final answer
    x = 201.18

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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.