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Finding the Fourth Proportional to 129.88, 178.86 and 113.56

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Solution

The fourth proportional to 129.88, 178.86 and 113.56 is: 156.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.88 : 178.86 = 113.56 : x
  2. Step 2: Convert to fraction form
    129.88/178.86 = 113.56/x
  3. Step 3: Cross multiply
    129.88x = 178.86 × 113.56
  4. Step 4: Simplify right side
    129.88x = 20,311.34
  5. Step 5: Solve for x
    x = 20,311.34/129.88
  6. Step 6: Final answer
    x = 156.39

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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.