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Finding the Fourth Proportional to 129.79, 178.15 and 115.67

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Solution

The fourth proportional to 129.79, 178.15 and 115.67 is: 158.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.79 : 178.15 = 115.67 : x
  2. Step 2: Convert to fraction form
    129.79/178.15 = 115.67/x
  3. Step 3: Cross multiply
    129.79x = 178.15 × 115.67
  4. Step 4: Simplify right side
    129.79x = 20,606.61
  5. Step 5: Solve for x
    x = 20,606.61/129.79
  6. Step 6: Final answer
    x = 158.77

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.