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Finding the Fourth Proportional to 112.87, 155.78 and 63.75

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Solution

The fourth proportional to 112.87, 155.78 and 63.75 is: 87.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.87 : 155.78 = 63.75 : x
  2. Step 2: Convert to fraction form
    112.87/155.78 = 63.75/x
  3. Step 3: Cross multiply
    112.87x = 155.78 × 63.75
  4. Step 4: Simplify right side
    112.87x = 9,930.98
  5. Step 5: Solve for x
    x = 9,930.98/112.87
  6. Step 6: Final answer
    x = 87.99

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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.