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Finding the Fourth Proportional to 112.75, 155.60 and 63.63

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Solution

The fourth proportional to 112.75, 155.60 and 63.63 is: 87.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.75 : 155.60 = 63.63 : x
  2. Step 2: Convert to fraction form
    112.75/155.60 = 63.63/x
  3. Step 3: Cross multiply
    112.75x = 155.60 × 63.63
  4. Step 4: Simplify right side
    112.75x = 9,900.83
  5. Step 5: Solve for x
    x = 9,900.83/112.75
  6. Step 6: Final answer
    x = 87.81

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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.