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Finding the Fourth Proportional to 119.79, 178.72 and 115.83

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Solution

The fourth proportional to 119.79, 178.72 and 115.83 is: 172.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.79 : 178.72 = 115.83 : x
  2. Step 2: Convert to fraction form
    119.79/178.72 = 115.83/x
  3. Step 3: Cross multiply
    119.79x = 178.72 × 115.83
  4. Step 4: Simplify right side
    119.79x = 20,700.85
  5. Step 5: Solve for x
    x = 20,700.85/119.79
  6. Step 6: Final answer
    x = 172.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.