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Finding the Fourth Proportional to 129.68, 194.70 and 118.34

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Solution

The fourth proportional to 129.68, 194.70 and 118.34 is: 177.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.68 : 194.70 = 118.34 : x
  2. Step 2: Convert to fraction form
    129.68/194.70 = 118.34/x
  3. Step 3: Cross multiply
    129.68x = 194.70 × 118.34
  4. Step 4: Simplify right side
    129.68x = 23,040.80
  5. Step 5: Solve for x
    x = 23,040.80/129.68
  6. Step 6: Final answer
    x = 177.67

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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.