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Finding the Fourth Proportional to 112.93, 169.22 and 85.80

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Solution

The fourth proportional to 112.93, 169.22 and 85.80 is: 128.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.93 : 169.22 = 85.80 : x
  2. Step 2: Convert to fraction form
    112.93/169.22 = 85.80/x
  3. Step 3: Cross multiply
    112.93x = 169.22 × 85.80
  4. Step 4: Simplify right side
    112.93x = 14,519.08
  5. Step 5: Solve for x
    x = 14,519.08/112.93
  6. Step 6: Final answer
    x = 128.57

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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.