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Finding the Fourth Proportional to 122.60, 183.92 and 92.40

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Solution

The fourth proportional to 122.60, 183.92 and 92.40 is: 138.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.60 : 183.92 = 92.40 : x
  2. Step 2: Convert to fraction form
    122.60/183.92 = 92.40/x
  3. Step 3: Cross multiply
    122.60x = 183.92 × 92.40
  4. Step 4: Simplify right side
    122.60x = 16,994.21
  5. Step 5: Solve for x
    x = 16,994.21/122.60
  6. Step 6: Final answer
    x = 138.62

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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.