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Finding the Fourth Proportional to 122.16, 183.09 and 78.69

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Solution

The fourth proportional to 122.16, 183.09 and 78.69 is: 117.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.16 : 183.09 = 78.69 : x
  2. Step 2: Convert to fraction form
    122.16/183.09 = 78.69/x
  3. Step 3: Cross multiply
    122.16x = 183.09 × 78.69
  4. Step 4: Simplify right side
    122.16x = 14,407.35
  5. Step 5: Solve for x
    x = 14,407.35/122.16
  6. Step 6: Final answer
    x = 117.94

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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.