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Finding the Fourth Proportional to 211.34, 316.68 and 165.48

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Solution

The fourth proportional to 211.34, 316.68 and 165.48 is: 247.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.34 : 316.68 = 165.48 : x
  2. Step 2: Convert to fraction form
    211.34/316.68 = 165.48/x
  3. Step 3: Cross multiply
    211.34x = 316.68 × 165.48
  4. Step 4: Simplify right side
    211.34x = 52,404.21
  5. Step 5: Solve for x
    x = 52,404.21/211.34
  6. Step 6: Final answer
    x = 247.96

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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.