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Finding the Fourth Proportional to 211.41, 316.90 and 87.84

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Solution

The fourth proportional to 211.41, 316.90 and 87.84 is: 131.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.41 : 316.90 = 87.84 : x
  2. Step 2: Convert to fraction form
    211.41/316.90 = 87.84/x
  3. Step 3: Cross multiply
    211.41x = 316.90 × 87.84
  4. Step 4: Simplify right side
    211.41x = 27,837.29
  5. Step 5: Solve for x
    x = 27,837.29/211.41
  6. Step 6: Final answer
    x = 131.67

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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.