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Finding the Fourth Proportional to 75.15, 112.66 and 54.85

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Solution

The fourth proportional to 75.15, 112.66 and 54.85 is: 82.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.15 : 112.66 = 54.85 : x
  2. Step 2: Convert to fraction form
    75.15/112.66 = 54.85/x
  3. Step 3: Cross multiply
    75.15x = 112.66 × 54.85
  4. Step 4: Simplify right side
    75.15x = 6,179.40
  5. Step 5: Solve for x
    x = 6,179.40/75.15
  6. Step 6: Final answer
    x = 82.23

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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.