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Finding the Fourth Proportional to 112.58, 155.28 and 75.68

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Solution

The fourth proportional to 112.58, 155.28 and 75.68 is: 104.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.58 : 155.28 = 75.68 : x
  2. Step 2: Convert to fraction form
    112.58/155.28 = 75.68/x
  3. Step 3: Cross multiply
    112.58x = 155.28 × 75.68
  4. Step 4: Simplify right side
    112.58x = 11,751.59
  5. Step 5: Solve for x
    x = 11,751.59/112.58
  6. Step 6: Final answer
    x = 104.38

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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.