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Finding the Fourth Proportional to 75.38, 112.92 and 72.05

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Solution

The fourth proportional to 75.38, 112.92 and 72.05 is: 107.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.38 : 112.92 = 72.05 : x
  2. Step 2: Convert to fraction form
    75.38/112.92 = 72.05/x
  3. Step 3: Cross multiply
    75.38x = 112.92 × 72.05
  4. Step 4: Simplify right side
    75.38x = 8,135.32
  5. Step 5: Solve for x
    x = 8,135.32/75.38
  6. Step 6: Final answer
    x = 107.93

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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.