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Finding the Fourth Proportional to 129.78, 194.66 and 43.12

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Solution

The fourth proportional to 129.78, 194.66 and 43.12 is: 64.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.78 : 194.66 = 43.12 : x
  2. Step 2: Convert to fraction form
    129.78/194.66 = 43.12/x
  3. Step 3: Cross multiply
    129.78x = 194.66 × 43.12
  4. Step 4: Simplify right side
    129.78x = 8,393.04
  5. Step 5: Solve for x
    x = 8,393.04/129.78
  6. Step 6: Final answer
    x = 64.67

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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.