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Finding the Fourth Proportional to 129.58, 178.48 and 104.94

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Solution

The fourth proportional to 129.58, 178.48 and 104.94 is: 144.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.58 : 178.48 = 104.94 : x
  2. Step 2: Convert to fraction form
    129.58/178.48 = 104.94/x
  3. Step 3: Cross multiply
    129.58x = 178.48 × 104.94
  4. Step 4: Simplify right side
    129.58x = 18,729.69
  5. Step 5: Solve for x
    x = 18,729.69/129.58
  6. Step 6: Final answer
    x = 144.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.