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Finding the Fourth Proportional to 211.34, 316.90 and 79.50

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Solution

The fourth proportional to 211.34, 316.90 and 79.50 is: 119.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.34 : 316.90 = 79.50 : x
  2. Step 2: Convert to fraction form
    211.34/316.90 = 79.50/x
  3. Step 3: Cross multiply
    211.34x = 316.90 × 79.50
  4. Step 4: Simplify right side
    211.34x = 25,193.55
  5. Step 5: Solve for x
    x = 25,193.55/211.34
  6. Step 6: Final answer
    x = 119.21

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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.