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Finding the Fourth Proportional to 211.50, 316.53 and 199.67

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Solution

The fourth proportional to 211.50, 316.53 and 199.67 is: 298.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.50 : 316.53 = 199.67 : x
  2. Step 2: Convert to fraction form
    211.50/316.53 = 199.67/x
  3. Step 3: Cross multiply
    211.50x = 316.53 × 199.67
  4. Step 4: Simplify right side
    211.50x = 63,199.96
  5. Step 5: Solve for x
    x = 63,199.96/211.50
  6. Step 6: Final answer
    x = 298.82

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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.