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Finding the Fourth Proportional to 112.86, 155.79 and 69.26

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Solution

The fourth proportional to 112.86, 155.79 and 69.26 is: 95.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.86 : 155.79 = 69.26 : x
  2. Step 2: Convert to fraction form
    112.86/155.79 = 69.26/x
  3. Step 3: Cross multiply
    112.86x = 155.79 × 69.26
  4. Step 4: Simplify right side
    112.86x = 10,789.24
  5. Step 5: Solve for x
    x = 10,789.24/112.86
  6. Step 6: Final answer
    x = 95.60

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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.