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Finding the Fourth Proportional to 122.51, 168.85 and 85.59

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Solution

The fourth proportional to 122.51, 168.85 and 85.59 is: 117.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.51 : 168.85 = 85.59 : x
  2. Step 2: Convert to fraction form
    122.51/168.85 = 85.59/x
  3. Step 3: Cross multiply
    122.51x = 168.85 × 85.59
  4. Step 4: Simplify right side
    122.51x = 14,451.98
  5. Step 5: Solve for x
    x = 14,451.98/122.51
  6. Step 6: Final answer
    x = 117.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.