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Finding the Fourth Proportional to 122.72, 184.10 and 45.68

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Solution

The fourth proportional to 122.72, 184.10 and 45.68 is: 68.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.72 : 184.10 = 45.68 : x
  2. Step 2: Convert to fraction form
    122.72/184.10 = 45.68/x
  3. Step 3: Cross multiply
    122.72x = 184.10 × 45.68
  4. Step 4: Simplify right side
    122.72x = 8,409.40
  5. Step 5: Solve for x
    x = 8,409.40/122.72
  6. Step 6: Final answer
    x = 68.53

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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.