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Finding the Fourth Proportional to 122.62, 184.05 and 89.72

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Solution

The fourth proportional to 122.62, 184.05 and 89.72 is: 134.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.62 : 184.05 = 89.72 : x
  2. Step 2: Convert to fraction form
    122.62/184.05 = 89.72/x
  3. Step 3: Cross multiply
    122.62x = 184.05 × 89.72
  4. Step 4: Simplify right side
    122.62x = 16,512.97
  5. Step 5: Solve for x
    x = 16,512.97/122.62
  6. Step 6: Final answer
    x = 134.67

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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.